Climate averages 1991–2020
Heroica Guaymas weather
in September.
A hot, moderately wet month: the joint 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Heroica Guaymas: daytime highs average 32.7°C and nights cool to about 27.0°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 59 mm of rain on roughly 6 days, which makes September a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 21 min on an average September day.
The nearest other city in this atlas is Ciudad Obregón (106 km away). In September its highs average 35.5°C, 2.8°C warmer than Heroica Guaymas, with 82 mm of rain.
Among the 153 cities listed in Mexico, Heroica Guaymas ranks joint 13th of 153 for the warmest September highs and 15th of 153 for the driest September (rainfall, lowest first). The mean September high of those 153 cities is 26.5°C; Heroica Guaymas is 6.2°C warmer than that mean.
From September to October, average highs fall by 2.1°C to 30.6°C, and monthly rainfall falls from 59 mm to 17 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Heroica Guaymas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.9°C12.8°C | 12.8°C | 8.4 | 1.3 | 10.611 h |
| February | 22.6°C13.5°C | 13.5°C | 11 | 1.5 | 11.211 h |
| March | 24.7°C15.2°C | 15.2°C | 5.4 | 0.5 | 12.012 h |
| April | 27.0°C17.6°C | 17.6°C | 1.3 | 0.2 | 12.813 h |
| May | 29.8°C20.8°C | 20.8°C | 0.3 | 0.1 | 13.514 h |
| June | 32.7°C25.1°C | 25.1°C | 1.2 | 0.2 | 13.914 h |
| July | 33.8°C28.1°C | 28.1°C | 9.8 | 2.4 | 13.714 h |
| August | 33.9°C28.5°C | 28.5°C | 26 | 4.5 | 13.113 h |
| September, selected | 32.7°C27.0°C | 27.0°C | 59 | 5.5 | 12.312 h |
| October | 30.6°C22.8°C | 22.8°C | 17 | 2.2 | 11.512 h |
| November | 26.1°C17.5°C | 17.5°C | 12 | 1.3 | 10.811 h |
| December | 22.0°C13.5°C | 13.5°C | 12 | 1.5 | 10.410 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Ciudad Obregón in SeptemberMexico · 106 kmHigh 35.5°C · Low 25.1°C · 82 mm rain
- Hermosillo in SeptemberMexico · 130 kmHigh 36.0°C · Low 24.5°C · 52 mm rain
- Navojoa in SeptemberMexico · 172 kmHigh 35.0°C · Low 25.0°C · 90 mm rain
- Los Mochis in SeptemberMexico · 303 kmHigh 33.3°C · Low 25.6°C · 102 mm rain
- Guasave in SeptemberMexico · 356 kmHigh 33.1°C · Low 25.0°C · 113 mm rain
- Nogales in SeptemberMexico · 377 kmHigh 30.2°C · Low 17.3°C · 49 mm rain
- Guamúchil in SeptemberMexico · 392 kmHigh 32.6°C · Low 24.5°C · 131 mm rain
- Cuauhtémoc in SeptemberMexico · 399 kmHigh 22.9°C · Low 12.9°C · 71 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Heroica Guaymas) is explained once on the Heroica Guaymas year overview and on the Sources, method and limits page.