Climate and average weather in San Carlos
In San Carlos, the summers are muggy, sweltering, dry, and mostly clear and the winters are warm and clear.
Over the course of the year, the temperature in San Carlos typically varies from 12°C to 35°C, and is rarely below 9°C or above 37°C. July is the hottest month of the year, while January is the coldest.
Based on the travel score, the best times of year to visit San Carlos for warm-weather activities are from early January to late April and early November to late December.
- Hottest
- Jul
- 35°
- Coldest
- Jan
- 12°
- Wettest
- Sep
- 62 mm
- Driest
- May
- 0 mm
- Rain / yr
- 154 mm
- 20 wet days
- Daylight
- 10.2–13.8 h
- shortest–longest
- Elevation
- 0 m
- 28.0°N
- Clearest
- Jun
- 12% cloud
San Carlos is town in Guaymas Municipality, State of Sonora, Mexico.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
San Carlos weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early January to late April.
Temperature through the year
Daily average highs and lows in San Carlos, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.6 months, from May 27 to October 13, with daily high temperatures above 32°C. The hottest month of the year in San Carlos is July, with an average high of 35°C and low of 29°C.
The cool season lasts 3.2 months, from November 30 to March 6, with daily high temperatures below 25°C. The coldest month of the year in San Carlos is January, with an average low of 12°C and high of 23°C.
Days typically run about 9°C warmer than nights, with the widest day–night swing (around 11°C) in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 24 | 26 | 28 | 31 | 34 | 35 | 35 | 34 | 32 | 27 | 23 |
| Avg low (°C) | 12 | 13 | 15 | 18 | 21 | 26 | 29 | 29 | 27 | 23 | 17 | 13 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 23 | 12 |
| Feb | 24 | 13 |
| Mar | 26 | 15 |
| Apr | 28 | 18 |
| May | 31 | 21 |
| Jun | 34 | 26 |
| Jul | 35 | 29 |
| Aug | 35 | 29 |
| Sep | 34 | 27 |
| Oct | 32 | 23 |
| Nov | 27 | 17 |
| Dec | 23 | 13 |
How hot and cold San Carlos really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, San Carlos feels like about 44°C (around August 15). About 147 days a year carry some heat stress, and 92 of them tip into dangerous heat (feels-like above 39°C), peaking in August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 23 | 24 | 26 | 28 | 31 | 36 | 42 | 43 | 41 | 33 | 27 | 23 |
| Air high (°C) | 23 | 24 | 26 | 28 | 31 | 34 | 35 | 35 | 34 | 32 | 27 | 23 |
| Feels-like low (°C) | 12 | 13 | 15 | 18 | 21 | 26 | 29 | 29 | 27 | 23 | 17 | 13 |
| Air low (°C) | 12 | 13 | 15 | 18 | 21 | 26 | 29 | 29 | 27 | 23 | 17 | 13 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 23 | 23 | 12 | 12 |
| Feb | 24 | 24 | 13 | 13 |
| Mar | 26 | 26 | 15 | 15 |
| Apr | 28 | 28 | 18 | 18 |
| May | 31 | 31 | 21 | 21 |
| Jun | 36 | 34 | 26 | 26 |
| Jul | 42 | 35 | 29 | 29 |
| Aug | 43 | 35 | 29 | 29 |
| Sep | 41 | 34 | 27 | 27 |
| Oct | 33 | 32 | 23 | 23 |
| Nov | 27 | 27 | 17 | 17 |
| Dec | 23 | 23 | 13 | 13 |
Average hourly temperature in San Carlos
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on July afternoons, near 35°C, and coldest before dawn in January, near 12°C.
San Carlos weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 23° / 12° | 6 | 1 | 10.4 | 8.8 |
| Feb | 24° / 13° | 7 | 1.2 | 11 | 8.8 |
| Mar | 26° / 15° | 4 | 0.5 | 11.8 | 8.8 |
| Apr | 28° / 18° | 1 | 0.3 | 12.6 | 7.9 |
| May | 31° / 21° | 0 | 0 | 13.4 | 6.1 |
| Jun | 34° / 26° | 1 | 0.2 | 13.7 | 4.3 |
| Jul | 35° / 29° | 10 | 2.4 | 13.6 | 3.1 |
| Aug | 35° / 29° | 22 | 4.2 | 13 | 3.0 |
| Sep | 34° / 27° | 62 | 5.4 | 12.2 | 3.7 |
| Oct | 32° / 23° | 18 | 2.3 | 11.3 | 5.5 |
| Nov | 27° / 17° | 12 | 1.3 | 10.6 | 8.1 |
| Dec | 23° / 13° | 10 | 1.2 | 10.3 | 8.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
San Carlos gets about 154 mm of precipitation a year. On a typical day the chance of rain is mostly dry, but that rises and falls sharply with the seasons.
The wetter season lasts 3.5 months, from around Jul 6 to Oct 20, peaking in September at about 22% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Apr 23.
September is the wettest month by volume, with 62 mm over about 5 wet days; May is the driest, with 0 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 3 | 4 | 2 | 1 | 0 | 1 | 7 | 14 | 18 | 7 | 4 | 4 |
| Rain days | 1 | 1 | 1 | 0 | 0 | 0 | 2 | 4 | 5 | 2 | 1 | 1 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 3 | 1 |
| Feb | 4 | 1 |
| Mar | 2 | 1 |
| Apr | 1 | 0 |
| May | 0 | 0 |
| Jun | 1 | 0 |
| Jul | 7 | 2 |
| Aug | 14 | 4 |
| Sep | 18 | 5 |
| Oct | 7 | 2 |
| Nov | 4 | 1 |
| Dec | 4 | 1 |
Monthly rainfall
Over a full year, San Carlos collects about 154 mm of rain across 20 wet days — roughly 13 mm in an average month.
It doesn’t fall evenly. September is the wettest month with 62 mm, while May is the driest at just 0 mm. The three wettest months alone bring about 66% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 6 | 7 | 4 | 1 | 0 | 1 | 10 | 22 | 62 | 18 | 12 | 10 |
| Rain days | 1 | 1 | 1 | 0 | 0 | 0 | 2 | 4 | 5 | 2 | 1 | 1 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 6 | 1 |
| Feb | 7 | 1 |
| Mar | 4 | 1 |
| Apr | 1 | 0 |
| May | 0 | 0 |
| Jun | 1 | 0 |
| Jul | 10 | 2 |
| Aug | 22 | 4 |
| Sep | 62 | 5 |
| Oct | 18 | 2 |
| Nov | 12 | 1 |
| Dec | 10 | 1 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In San Carlos, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around April 22 and lasts for 2.5 months, ending around July 5. The clearest month is June, when the sky is clear, mostly clear, or partly cloudy 93% of the time on average.
The cloudier part of the year begins around November 8 and lasts for 4.3 months, ending around March 17. The cloudiest month is February, when it is overcast or mostly cloudy 31% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 75 | 69 | 77 | 79 | 89 | 93 | 74 | 74 | 85 | 88 | 78 | 76 |
| Cloudier (%) | 25 | 31 | 23 | 21 | 11 | 7 | 26 | 26 | 15 | 12 | 22 | 24 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 75 | 25 |
| Feb | 69 | 31 |
| Mar | 77 | 23 |
| Apr | 79 | 21 |
| May | 89 | 11 |
| Jun | 93 | 7 |
| Jul | 74 | 26 |
| Aug | 74 | 26 |
| Sep | 85 | 15 |
| Oct | 88 | 12 |
| Nov | 78 | 22 |
| Dec | 76 | 24 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 14, brings about 13 h 48 min of light; the shortest, around December 14, only 10 h 12 min — a swing of roughly 3 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.4 | 11.0 | 11.8 | 12.6 | 13.4 | 13.7 | 13.6 | 13.0 | 12.2 | 11.3 | 10.6 | 10.3 |
| Sunrise (AM) | 7:21 | 7:08 | 6:40 | 6:04 | 5:39 | 5:32 | 5:41 | 5:58 | 6:14 | 6:30 | 6:52 | 7:13 |
| Sunset (PM) | 5:46 | 6:09 | 6:28 | 6:44 | 7:02 | 7:17 | 7:18 | 6:58 | 6:23 | 5:49 | 5:27 | 5:27 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.4 | 7:21 | 5:46 |
| Feb | 11.0 | 7:08 | 6:09 |
| Mar | 11.8 | 6:40 | 6:28 |
| Apr | 12.6 | 6:04 | 6:44 |
| May | 13.4 | 5:39 | 7:02 |
| Jun | 13.7 | 5:32 | 7:17 |
| Jul | 13.6 | 5:41 | 7:18 |
| Aug | 13.0 | 5:58 | 6:58 |
| Sep | 12.2 | 6:14 | 6:23 |
| Oct | 11.3 | 6:30 | 5:49 |
| Nov | 10.6 | 6:52 | 5:27 |
| Dec | 10.3 | 7:13 | 5:27 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
San Carlos averages about 21 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 15 and 28 days.
The sunnier stretch runs 2.5 months, from around Apr 20 to Jul 3. The sunniest month is June, with roughly 27 sunny days (brilliant).
The greyest month is July, down near 17 sunny days — about 35% fewer than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 20 | 17 | 21 | 21 | 26 | 26 | 18 | 17 | 23 | 26 | 21 | 21 |
| Sky | Bright | Bright | Bright | Bright | Brilliant | Brilliant | Bright | Bright | Brilliant | Brilliant | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 20 | Bright |
| Feb | 17 | Bright |
| Mar | 21 | Bright |
| Apr | 21 | Bright |
| May | 26 | Brilliant |
| Jun | 26 | Brilliant |
| Jul | 18 | Bright |
| Aug | 17 | Bright |
| Sep | 23 | Brilliant |
| Oct | 26 | Brilliant |
| Nov | 21 | Bright |
| Dec | 21 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In San Carlos, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 5.6 months, from around May 23 to November 9. The muggiest month is July, when the air feels humid, muggy or worse about 99% of the time.
The most comfortable stretch runs from around November 10 to May 22, and January is the most comfortable month — the air is dry or comfortable 99% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 86 | 80 | 78 | 64 | 30 | 3 | 0 | 0 | 0 | 6 | 32 | 74 |
| Comfortable (%) | 12 | 15 | 18 | 25 | 30 | 11 | 1 | 0 | 1 | 13 | 30 | 18 |
| Humid (%) | 1 | 5 | 4 | 9 | 22 | 14 | 2 | 0 | 3 | 23 | 26 | 7 |
| Muggy (%) | 0 | 0 | 0 | 2 | 14 | 23 | 5 | 2 | 9 | 30 | 10 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 3 | 40 | 47 | 19 | 20 | 18 | 1 | 0 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 9 | 46 | 79 | 67 | 10 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 86 | 12 | 1 | 0 | 0 | 0 |
| Feb | 80 | 15 | 5 | 0 | 0 | 0 |
| Mar | 78 | 18 | 4 | 0 | 0 | 0 |
| Apr | 64 | 25 | 9 | 2 | 0 | 0 |
| May | 30 | 30 | 22 | 14 | 3 | 0 |
| Jun | 3 | 11 | 14 | 23 | 40 | 9 |
| Jul | 0 | 1 | 2 | 5 | 47 | 46 |
| Aug | 0 | 0 | 0 | 2 | 19 | 79 |
| Sep | 0 | 1 | 3 | 9 | 20 | 67 |
| Oct | 6 | 13 | 23 | 30 | 18 | 10 |
| Nov | 32 | 30 | 26 | 10 | 1 | 0 |
| Dec | 74 | 18 | 7 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in San Carlos is steady company: average speeds sit near 12 km/h — light breeze — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 13 | 13 | 13 | 12 | 13 | 14 | 13 | 12 | 11 | 12 | 13 |
| Feels | light breeze | light breeze | light breeze | light breeze | calm | light breeze | light breeze | light breeze | calm | calm | calm | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 12 | light breeze |
| Feb | 13 | light breeze |
| Mar | 13 | light breeze |
| Apr | 13 | light breeze |
| May | 12 | calm |
| Jun | 13 | light breeze |
| Jul | 14 | light breeze |
| Aug | 13 | light breeze |
| Sep | 12 | calm |
| Oct | 11 | calm |
| Nov | 12 | calm |
| Dec | 13 | light breeze |
Hazard calendar for San Carlos
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
San Carlos sits in the eastern Pacific hurricane zone; the season peaks August–September.
Best time to visit San Carlos
To characterize how pleasant the weather is in San Carlos throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid April, San Carlos is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit San Carlos for general outdoor tourist activities is from early November to late April, with a peak score in the second week of January.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 8.8 | 8.8 | 8.8 | 7.9 | 6.1 | 4.4 | 3.2 | 3.0 | 3.7 | 5.5 | 8.1 | 8.8 |
| Rating | ideal | ideal | ideal | ideal | good | fair | poor | poor | fair | good | ideal | ideal |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 8.8 | ideal |
| Feb | 8.8 | ideal |
| Mar | 8.8 | ideal |
| Apr | 7.9 | ideal |
| May | 6.1 | good |
| Jun | 4.4 | fair |
| Jul | 3.2 | poor |
| Aug | 3.0 | poor |
| Sep | 3.7 | fair |
| Oct | 5.5 | good |
| Nov | 8.1 | ideal |
| Dec | 8.8 | ideal |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit San Carlos for hot-weather activities run from late February to late June and again from late September to early December, with a peak score in the last week of April.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for San Carlos, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around July (highs near 35°C), the essentials are light clothes and sun protection. In the cold season around January (highs near 23°C), pack light clothes.
In July, San Carlos sees daytime highs around 35°C and nights near 29°C. Pack light clothes and sun protection.
Sea temperature near San Carlos
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea offshore is warmest in August at about 30°C and coldest in February near 18°C.
It's comfortable for a long swim from Apr 6 to Dec 16 — about 8.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 18 | 18 | 19 | 21 | 24 | 27 | 29 | 30 | 30 | 28 | 23 | 20 |
| Comfort | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Warm | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 18 | Cool |
| Feb | 18 | Cool |
| Mar | 19 | Cool |
| Apr | 21 | Refreshing |
| May | 24 | Refreshing |
| Jun | 27 | Warm |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 28 | Warm |
| Nov | 23 | Refreshing |
| Dec | 20 | Cool |
UV index (midday) in San Carlos by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in San Carlos peaks around July 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 5 | 6 | 8 | 10 | 10 | 12 | 12 | 11 | 10 | 7 | 5 | 4 |
| Level | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 6 | High |
| Mar | 8 | Very high |
| Apr | 10 | Very high |
| May | 10 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 7 | Very high |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Average hourly UV index in San Carlos
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in July the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 4.5 | 5 | 6.5 | 7.5 | 8 | 8.5 | 9 | 8 | 7.5 | 6 | 5 | 3.5 |
| UV ≥ 6 (h/day) | 0 | 0 | 4 | 5 | 5.5 | 6.5 | 6.5 | 6 | 5 | 3 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 4.5 | 0 |
| Feb | 5 | 0 |
| Mar | 6.5 | 4 |
| Apr | 7.5 | 5 |
| May | 8 | 5.5 |
| Jun | 8.5 | 6.5 |
| Jul | 9 | 6.5 |
| Aug | 8 | 6 |
| Sep | 7.5 | 5 |
| Oct | 6 | 3 |
| Nov | 5 | 0 |
| Dec | 3.5 | 0 |
Air quality in San Carlos by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in San Carlos is worst in July — around 18 µg/m³ PM2.5 (moderate), about 3.9× the cleanest month (January, 5 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 5 | 5 | 5 | 6 | 5 | 8 | 18 | 13 | 8 | 5 | 5 | 5 |
| Level | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 5 | Good |
| Feb | 5 | Good |
| Mar | 5 | Good |
| Apr | 6 | Good |
| May | 5 | Good |
| Jun | 8 | Good |
| Jul | 18 | Moderate |
| Aug | 13 | Moderate |
| Sep | 8 | Good |
| Oct | 5 | Good |
| Nov | 5 | Good |
| Dec | 5 | Good |
Growing season
San Carlos is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. San Carlos banks about 5,377 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 234 | 237 | 323 | 385 | 497 | 588 | 673 | 678 | 619 | 530 | 363 | 249 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 234 |
| Feb | 237 |
| Mar | 323 |
| Apr | 385 |
| May | 497 |
| Jun | 588 |
| Jul | 673 |
| Aug | 678 |
| Sep | 619 |
| Oct | 530 |
| Nov | 363 |
| Dec | 249 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
San Carlos receives about 6.1 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 3.9 and 8.2 kWh/m².
The brighter stretch of the year lasts 5.9 months, from around Mar 8 to Sep 4. The brightest month is May, averaging about 8.1 kWh/m² (intense).
The dimmest month is December, down near 3.9 kWh/m² — roughly 52% less than the May peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.2 | 5.1 | 6.5 | 7.5 | 8.2 | 8.0 | 7.1 | 6.6 | 5.9 | 5.4 | 4.4 | 3.9 |
| Level | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 4.2 | Bright |
| Feb | 5.1 | Bright |
| Mar | 6.5 | Intense |
| Apr | 7.5 | Intense |
| May | 8.2 | Intense |
| Jun | 8.0 | Intense |
| Jul | 7.1 | Intense |
| Aug | 6.6 | Intense |
| Sep | 5.9 | Bright |
| Oct | 5.4 | Bright |
| Nov | 4.4 | Bright |
| Dec | 3.9 | Moderate |
Where is San Carlos?
San Carlos sits at 28.0°N, 111.0°W, 0 m above sea level, in Mexico. The nearest listed city is Heroica Guaymas, 15 km away.
Topography around San Carlos
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Carlos.
Within 3 km, the terrain around San Carlos has only modest variations in elevation — a maximum elevation change of 236 m around an average of 23 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 838 m; within 80 km, large variations in elevation — a maximum elevation change of 1,146 m.
The land around San Carlos is covered by water (40%) and shrubs (39%) within 3 km, shrubs (46%) and water (46%) within 16 km, and shrubs (46%) and water (42%) within 80 km.
Mexico travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 / 127 V · 60 Hz
- Prices
- ≈ 54% of US
- price level, 2025
- GDP per capita
- $13,889
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 43%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 12.8
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 440
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for San Carlos (27.9575°, -111.0435°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).