Heroica Guaymas weather in September
In September, Heroica Guaymas sees average daytime highs of 34°C and overnight lows near 27°C, with 59 mm of rain across 5.5 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.
Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 77% of the time in September, and the air most often feels miserable.
Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Heroica Guaymas's 4th-clearest and 10th-windiest month. For the whole year in context, see Heroica Guaymas's year-round climate.
- Daytime high
- 34°
- 3rd warmest
- Overnight low
- 27°
- 10th coldest
- Rainfall
- 59 mm
- 5.5 wet days
- Daylight
- 12 h 12 min
- 6:13 AM – 6:23 PM
- Cloud cover
- 24%
- 4th clearest
- Wind
- 12 km/h
- 10th windiest
- Solar energy
- 5.94 kWh/m²
- Travel score
- 3.7
- out of 10
Heroica Guaymas is municipal seat of Guaymas, State of Sonora, Mexico.
- Founded
- 1701
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 34°C through the month.
A typical September day in Heroica Guaymas reaches about 34°C in the afternoon and slips back to 27°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
| Avg low (°C) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 34 | 28 |
| 2 | 34 | 28 |
| 3 | 34 | 28 |
| 4 | 34 | 28 |
| 5 | 34 | 28 |
| 6 | 34 | 28 |
| 7 | 34 | 28 |
| 8 | 34 | 28 |
| 9 | 34 | 28 |
| 10 | 34 | 28 |
| 11 | 34 | 28 |
| 12 | 34 | 28 |
| 13 | 34 | 28 |
| 14 | 34 | 28 |
| 15 | 34 | 27 |
| 16 | 34 | 27 |
| 17 | 34 | 27 |
| 18 | 34 | 27 |
| 19 | 34 | 27 |
| 20 | 34 | 27 |
| 21 | 34 | 27 |
| 22 | 34 | 27 |
| 23 | 34 | 27 |
| 24 | 34 | 27 |
| 25 | 34 | 26 |
| 26 | 34 | 26 |
| 27 | 34 | 26 |
| 28 | 34 | 26 |
| 29 | 34 | 26 |
| 30 | 34 | 26 |
How September really feels in Heroica Guaymas
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Heroica Guaymas weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.
| 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 September
The sky is clear or mostly clear about 77% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 78 | 79 | 80 | 80 | 80 | 82 | 82 | 82 | 84 | 84 | 84 | 85 | 86 | 87 | 87 | 87 | 88 | 88 | 88 | 88 | 88 | 88 | 88 | 89 | 89 | 89 | 89 | 90 | 90 | 90 |
| Cloudier (%) | 22 | 21 | 20 | 20 | 20 | 18 | 18 | 18 | 16 | 16 | 16 | 15 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 78 | 22 |
| 2 | 79 | 21 |
| 3 | 80 | 20 |
| 4 | 80 | 20 |
| 5 | 80 | 20 |
| 6 | 82 | 18 |
| 7 | 82 | 18 |
| 8 | 82 | 18 |
| 9 | 84 | 16 |
| 10 | 84 | 16 |
| 11 | 84 | 16 |
| 12 | 85 | 15 |
| 13 | 86 | 14 |
| 14 | 87 | 13 |
| 15 | 87 | 13 |
| 16 | 87 | 13 |
| 17 | 88 | 12 |
| 18 | 88 | 12 |
| 19 | 88 | 12 |
| 20 | 88 | 12 |
| 21 | 88 | 12 |
| 22 | 88 | 12 |
| 23 | 88 | 12 |
| 24 | 89 | 11 |
| 25 | 89 | 11 |
| 26 | 89 | 11 |
| 27 | 89 | 11 |
| 28 | 90 | 10 |
| 29 | 90 | 10 |
| 30 | 90 | 10 |
Chance of precipitation in September
Heroica Guaymas gets around 59 mm of rain over 5.5 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 18% and peaks near 23% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 14 | 13 | 13 | 12 | 12 |
| Rain chance (%) | |
|---|---|
| 1 | 23 |
| 2 | 23 |
| 3 | 23 |
| 4 | 23 |
| 5 | 23 |
| 6 | 22 |
| 7 | 22 |
| 8 | 21 |
| 9 | 21 |
| 10 | 21 |
| 11 | 20 |
| 12 | 20 |
| 13 | 19 |
| 14 | 19 |
| 15 | 19 |
| 16 | 18 |
| 17 | 18 |
| 18 | 17 |
| 19 | 17 |
| 20 | 17 |
| 21 | 16 |
| 22 | 16 |
| 23 | 15 |
| 24 | 15 |
| 25 | 15 |
| 26 | 14 |
| 27 | 13 |
| 28 | 13 |
| 29 | 12 |
| 30 | 12 |
Humidity in September
Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the miserable band about 68% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 |
| Humid (%) | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 6 | 7 | 8 |
| Muggy (%) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 19 | 20 | 22 |
| Oppressive (%) | 12 | 11 | 11 | 12 | 12 | 12 | 13 | 13 | 14 | 15 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 24 | 25 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 29 |
| Miserable (%) | 85 | 85 | 85 | 84 | 84 | 84 | 83 | 83 | 81 | 80 | 79 | 78 | 77 | 74 | 73 | 71 | 69 | 67 | 63 | 61 | 60 | 58 | 56 | 54 | 52 | 50 | 47 | 44 | 41 | 38 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 0 | 3 | 12 | 85 |
| 2 | 0 | 1 | 3 | 11 | 85 |
| 3 | 0 | 1 | 3 | 11 | 85 |
| 4 | 0 | 1 | 3 | 12 | 84 |
| 5 | 0 | 1 | 3 | 12 | 84 |
| 6 | 0 | 1 | 3 | 12 | 84 |
| 7 | 0 | 1 | 3 | 13 | 83 |
| 8 | 0 | 1 | 3 | 13 | 83 |
| 9 | 0 | 2 | 3 | 14 | 81 |
| 10 | 0 | 2 | 3 | 15 | 80 |
| 11 | 0 | 2 | 4 | 15 | 79 |
| 12 | 0 | 2 | 4 | 16 | 78 |
| 13 | 0 | 2 | 4 | 17 | 77 |
| 14 | 0 | 3 | 5 | 18 | 74 |
| 15 | 0 | 3 | 5 | 19 | 73 |
| 16 | 0 | 3 | 6 | 20 | 71 |
| 17 | 0 | 3 | 7 | 21 | 69 |
| 18 | 0 | 3 | 8 | 22 | 67 |
| 19 | 1 | 4 | 9 | 23 | 63 |
| 20 | 1 | 4 | 10 | 24 | 61 |
| 21 | 1 | 4 | 11 | 24 | 60 |
| 22 | 1 | 4 | 12 | 25 | 58 |
| 23 | 1 | 4 | 13 | 26 | 56 |
| 24 | 1 | 4 | 14 | 27 | 54 |
| 25 | 1 | 5 | 15 | 27 | 52 |
| 26 | 2 | 5 | 16 | 28 | 50 |
| 27 | 2 | 5 | 17 | 28 | 47 |
| 28 | 2 | 6 | 19 | 29 | 44 |
| 29 | 2 | 7 | 20 | 29 | 41 |
| 30 | 3 | 8 | 22 | 29 | 38 |
Wind in September
Winds average 12 km/h in September.
Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 13 | light breeze |
| 2 | 12 | light breeze |
| 3 | 12 | light breeze |
| 4 | 12 | light breeze |
| 5 | 12 | light breeze |
| 6 | 12 | light breeze |
| 7 | 12 | light breeze |
| 8 | 12 | light breeze |
| 9 | 12 | light breeze |
| 10 | 12 | light breeze |
| 11 | 12 | light breeze |
| 12 | 12 | calm |
| 13 | 12 | calm |
| 14 | 12 | calm |
| 15 | 12 | calm |
| 16 | 12 | calm |
| 17 | 12 | calm |
| 18 | 12 | calm |
| 19 | 12 | calm |
| 20 | 12 | calm |
| 21 | 12 | calm |
| 22 | 12 | calm |
| 23 | 12 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 36 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 48 minutes over September. Sunrise moves from 6:06 AM to 6:20 AM, and sunset from 6:41 PM to 6:06 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 |
| Sunrise (AM) | 6:06 | 6:06 | 6:07 | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:20 |
| Sunset (PM) | 6:41 | 6:40 | 6:38 | 6:37 | 6:36 | 6:35 | 6:34 | 6:33 | 6:31 | 6:30 | 6:29 | 6:28 | 6:27 | 6:25 | 6:24 | 6:23 | 6:22 | 6:20 | 6:19 | 6:18 | 6:17 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:09 | 6:08 | 6:07 | 6:06 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.6 | 6:06 | 6:41 |
| 2 | 12.6 | 6:06 | 6:40 |
| 3 | 12.5 | 6:07 | 6:38 |
| 4 | 12.5 | 6:07 | 6:37 |
| 5 | 12.5 | 6:08 | 6:36 |
| 6 | 12.4 | 6:08 | 6:35 |
| 7 | 12.4 | 6:09 | 6:34 |
| 8 | 12.4 | 6:09 | 6:33 |
| 9 | 12.4 | 6:10 | 6:31 |
| 10 | 12.3 | 6:10 | 6:30 |
| 11 | 12.3 | 6:11 | 6:29 |
| 12 | 12.3 | 6:11 | 6:28 |
| 13 | 12.2 | 6:12 | 6:27 |
| 14 | 12.2 | 6:12 | 6:25 |
| 15 | 12.2 | 6:13 | 6:24 |
| 16 | 12.2 | 6:13 | 6:23 |
| 17 | 12.1 | 6:13 | 6:22 |
| 18 | 12.1 | 6:14 | 6:20 |
| 19 | 12.1 | 6:14 | 6:19 |
| 20 | 12.0 | 6:15 | 6:18 |
| 21 | 12.0 | 6:15 | 6:17 |
| 22 | 12.0 | 6:16 | 6:15 |
| 23 | 12.0 | 6:16 | 6:14 |
| 24 | 11.9 | 6:17 | 6:13 |
| 25 | 11.9 | 6:17 | 6:12 |
| 26 | 11.9 | 6:18 | 6:11 |
| 27 | 11.9 | 6:18 | 6:09 |
| 28 | 11.8 | 6:19 | 6:08 |
| 29 | 11.8 | 6:19 | 6:07 |
| 30 | 11.8 | 6:20 | 6:06 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.94 kWh/m².
For context, solar energy here swings from a low near 3.9 kWh/m² to a high of 8.14 kWh/m² in May across the year — September's 5.94 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.1 | Intense |
| 2 | 6.1 | Intense |
| 3 | 6.1 | Intense |
| 4 | 6.1 | Intense |
| 5 | 6.1 | Intense |
| 6 | 6.0 | Intense |
| 7 | 6.0 | Intense |
| 8 | 6.0 | Intense |
| 9 | 6.0 | Intense |
| 10 | 6.0 | Intense |
| 11 | 6.0 | Intense |
| 12 | 6.0 | Bright |
| 13 | 6.0 | Bright |
| 14 | 6.0 | Bright |
| 15 | 6.0 | Bright |
| 16 | 6.0 | Bright |
| 17 | 5.9 | Bright |
| 18 | 5.9 | Bright |
| 19 | 5.9 | Bright |
| 20 | 5.9 | Bright |
| 21 | 5.9 | Bright |
| 22 | 5.9 | Bright |
| 23 | 5.9 | Bright |
| 24 | 5.8 | Bright |
| 25 | 5.8 | Bright |
| 26 | 5.8 | Bright |
| 27 | 5.8 | Bright |
| 28 | 5.8 | Bright |
| 29 | 5.8 | Bright |
| 30 | 5.8 | Bright |
Hazard calendar for Heroica Guaymas
In September, Heroica Guaymas sits inside 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 September a good time to visit Heroica Guaymas?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Heroica Guaymas. The water and warmth also suit a beach or pool day.
What to pack for Heroica Guaymas in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Heroica Guaymas sees daytime highs around 34°C and nights near 27°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.
Sea temperature near Heroica Guaymas in September
The nearest coast averages about 30°C in September — 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 September
Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). 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 September
Average fine-particle pollution (PM2.5) through the year — so you can see where September 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. 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).