Climate averages 1991–2020
San Luis Río Colorado weather
in September.
A very hot, very dry month: the 4th warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in San Luis Río Colorado: daytime highs average 37.9°C and nights cool to about 24.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 13 mm of rain on roughly 2 days, which makes September a very dry month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 12 h 24 min on an average September day.
The nearest other city in this atlas is Yuma (33 km away). In September its highs average 38.6°C, 0.6°C warmer than San Luis Río Colorado, with 12 mm of rain.
Among the 153 cities listed in Mexico, San Luis Río Colorado ranks 2nd of 153 for the warmest September highs and 5th of 153 for the driest September (rainfall, lowest first). The mean September high of those 153 cities is 26.5°C; San Luis Río Colorado is 11.4°C warmer than that mean.
From September to October, average highs fall by 6.0°C to 32.0°C, and monthly rainfall falls from 13 mm to 4.9 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
San Luis Río Colorado climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.0°C8.6°C | 8.6°C | 9.2 | 1.5 | 10.310 h |
| February | 22.9°C9.9°C | 9.9°C | 13 | 2.3 | 11.011 h |
| March | 26.7°C12.5°C | 12.5°C | 10 | 1.5 | 12.012 h |
| April | 30.3°C15.3°C | 15.3°C | 3.0 | 0.6 | 13.013 h |
| May | 34.5°C18.9°C | 18.9°C | 0.7 | 0.2 | 13.814 h |
| June | 39.3°C23.1°C | 23.1°C | 0.6 | 0.2 | 14.214 h |
| July | 41.2°C27.4°C | 27.4°C | 4.8 | 1.5 | 14.114 h |
| August | 40.8°C28.0°C | 28.0°C | 11 | 2.9 | 13.313 h |
| September, selected | 37.9°C24.8°C | 24.8°C | 13 | 2.2 | 12.412 h |
| October | 32.0°C18.5°C | 18.5°C | 4.9 | 0.9 | 11.411 h |
| November | 25.2°C12.5°C | 12.5°C | 5.5 | 0.8 | 10.511 h |
| December | 19.9°C8.1°C | 8.1°C | 9.2 | 1.7 | 10.110 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
- Yuma in SeptemberUnited States · 33 kmHigh 38.6°C · Low 24.8°C · 12 mm rain
- Mexicali in SeptemberMexico · 67 kmHigh 38.3°C · Low 24.3°C · 8.9 mm rain
- Ensenada in SeptemberMexico · 184 kmHigh 27.8°C · Low 19.5°C · 4.3 mm rain
- Indio in SeptemberUnited States · 195 kmHigh 37.7°C · Low 24.7°C · 7.1 mm rain
- El Cajon in SeptemberUnited States · 209 kmHigh 27.6°C · Low 17.8°C · 4.4 mm rain
- Tijuana in SeptemberMexico · 210 kmHigh 24.4°C · Low 17.9°C · 4.0 mm rain
- Rosarito in SeptemberMexico · 214 kmHigh 24.5°C · Low 18.5°C · 3.1 mm rain
- Chula Vista in SeptemberUnited States · 218 kmHigh 24.2°C · Low 17.6°C · 4.4 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 San Luis Río Colorado) is explained once on the San Luis Río Colorado year overview and on the Sources, method and limits page.