Climate averages 1991–2020
Indio weather
in September.
A very hot, very dry month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in Indio: daytime highs average 37.7°C and nights cool to about 24.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 7.1 mm of rain on roughly 2 days, which makes September a very dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 25 min on an average September day.
The nearest other city in this atlas is Hemet (70 km away). In September its highs average 30.9°C, 6.8°C cooler than Indio, with 5.0 mm of rain.
Among the 498 cities listed in the United States, Indio ranks 2nd of 498 for the warmest September highs and 99th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Indio is 10.8°C warmer than that mean.
From September to October, average highs fall by 6.4°C to 31.3°C, and monthly rainfall rises from 7.1 mm to 8.0 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
Indio climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.7°C9.6°C | 9.6°C | 28 | 3.6 | 10.210 h |
| February | 21.5°C10.7°C | 10.7°C | 34 | 4.1 | 11.011 h |
| March | 25.4°C12.9°C | 12.9°C | 17 | 2.9 | 12.012 h |
| April | 29.2°C15.2°C | 15.2°C | 6.8 | 1.4 | 13.013 h |
| May | 33.6°C18.6°C | 18.6°C | 2.8 | 0.9 | 13.914 h |
| June | 38.9°C22.9°C | 22.9°C | 0.7 | 0.2 | 14.414 h |
| July | 41.5°C27.2°C | 27.2°C | 7.2 | 1.8 | 14.214 h |
| August | 41.0°C27.8°C | 27.8°C | 8.6 | 2.2 | 13.413 h |
| September, selected | 37.7°C24.7°C | 24.7°C | 7.1 | 1.8 | 12.412 h |
| October | 31.3°C18.9°C | 18.9°C | 8.0 | 1.2 | 11.411 h |
| November | 24.3°C13.3°C | 13.3°C | 8.6 | 1.5 | 10.410 h |
| December | 18.9°C9.1°C | 9.1°C | 25 | 2.9 | 10.010 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
- Hemet in SeptemberUnited States · 70 kmHigh 30.9°C · Low 17.6°C · 5.0 mm rain
- Menifee in SeptemberUnited States · 86 kmHigh 30.8°C · Low 17.2°C · 6.0 mm rain
- Temecula in SeptemberUnited States · 90 kmHigh 31.5°C · Low 17.6°C · 5.0 mm rain
- Perris in SeptemberUnited States · 94 kmHigh 30.7°C · Low 17.3°C · 6.0 mm rain
- Murrieta in SeptemberUnited States · 94 kmHigh 31.3°C · Low 17.9°C · 5.0 mm rain
- Redlands in SeptemberUnited States · 97 kmHigh 32.0°C · Low 17.7°C · 7.8 mm rain
- Moreno Valley in SeptemberUnited States · 97 kmHigh 30.8°C · Low 17.2°C · 7.8 mm rain
- Escondido in SeptemberUnited States · 105 kmHigh 28.1°C · Low 17.5°C · 5.1 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 Indio) is explained once on the Indio year overview and on the Sources, method and limits page.