Heroica Guaymas in Fall
In fall (September, October and November), Heroica Guaymas sees average daytime highs around 31°C and overnight lows near 22°C, with 88 mm of rain over about 9 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 34°C in early September to 25°C by late November. The sky is clear or mostly clear about 76% of the time across fall, and the air most often feels miserable.
Fall is Heroica Guaymas's 3rd-best season to visit on our travel score. For the whole year in context, see Heroica Guaymas's year-round climate.
- Avg daytime high
- 31°C
- 2nd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 88 mm
- 9 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.8
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Heroica Guaymas in Fall
Over the season highs ease from about 34°C in early September to 25°C by late November.
A typical fall day in Heroica Guaymas reaches about 31°C and drops to 22°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Heroica Guaymas
Once humidity and wind are folded in, fall brings about 50 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Heroica Guaymas weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 23° / 12° | 8 | 1.3 | 10.4 | 8.7 |
| Feb | 24° / 13° | 11 | 1.5 | 11 | 8.7 |
| Mar | 26° / 15° | 5 | 0.5 | 11.8 | 8.8 |
| Apr | 28° / 18° | 1 | 0.2 | 12.6 | 8.0 |
| May | 31° / 21° | 0 | 0.1 | 13.4 | 6.1 |
| Jun | 34° / 25° | 1 | 0.2 | 13.7 | 4.4 |
| Jul | 35° / 29° | 10 | 2.4 | 13.6 | 3.2 |
| Aug | 35° / 29° | 26 | 4.5 | 13 | 3.0 |
| Sep | 34° / 27° | 59 | 5.5 | 12.2 | 3.7 |
| Oct | 32° / 23° | 17 | 2.2 | 11.3 | 5.5 |
| Nov | 27° / 17° | 12 | 1.3 | 10.6 | 8.2 |
| Dec | 23° / 13° | 13 | 1.5 | 10.3 | 8.7 |
Cloud cover in Fall
The sky is clear or mostly clear about 76% of the time across fall.
Chance of precipitation in Fall
Heroica Guaymas gets around 88 mm of rain over 9 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 12 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 36 min in early September to 10 h 24 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 5.2 kWh/m².
Hazard calendar for Heroica Guaymas
In fall, Heroica Guaymas overlaps its pacific hurricane season. The full year is below, with each hazard's peak months called out.
Heroica Guaymas sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is fall a good time to visit Heroica Guaymas?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Heroica Guaymas for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Heroica Guaymas in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Heroica Guaymas sees daytime highs around 31°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 9 days see rain.
Sea temperature near Heroica Guaymas in Fall
The nearest coast averages about 27°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 30°C and coldest in January near 18°C.
It's comfortable for a long swim from Apr 6 to Dec 15 — 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 in Heroica Guaymas in Fall
Clear-sky midday UV across fall averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Heroica Guaymas 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 | 6 | 4 |
| Level | Moderate | High | Very high | Extreme | 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 | Extreme |
| May | 10 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 7 | Very high |
| Nov | 6 | High |
| Dec | 4 | Moderate |
Air quality in Heroica Guaymas in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Heroica Guaymas 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 |
Where is Heroica Guaymas?
Heroica Guaymas sits at 27.9°N, 110.9°W, 18 m above sea level, in Mexico. The nearest listed city is Empalme, 10 km away.
Topography around Heroica Guaymas
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Heroica Guaymas.
Within 3 km, the terrain around Heroica Guaymas has significant variations in elevation — a maximum elevation change of 469 m around an average of 58 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 469 m; within 80 km, large variations in elevation — a maximum elevation change of 1,146 m.
The land around Heroica Guaymas is covered by shrubs (40%) and artificial surfaces (33%) within 3 km, water (51%) and shrubs (34%) within 16 km, and shrubs (50%) and water (38%) 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 Heroica Guaymas (27.9199°, -110.8989°, elevation 18 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.