Climate averages 1991–2020
Henderson 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 Henderson: daytime highs average 34.1°C and nights cool to about 21.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 6.5 mm of rain on roughly 1 day, which makes September a very dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Paradise (16 km away). In September its highs average 33.6°C, 0.5°C cooler than Henderson, with 7.8 mm of rain.
Among the 498 cities listed in the United States, Henderson ranks joint 14th of 498 for the warmest September highs and 96th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Henderson is 7.2°C warmer than that mean.
From September to October, average highs fall by 7.3°C to 26.8°C, and monthly rainfall rises from 6.5 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
Henderson climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.6°C5.5°C | 5.5°C | 19 | 3.2 | 10.010 h |
| February | 16.7°C6.5°C | 6.5°C | 25 | 4.0 | 10.811 h |
| March | 21.2°C9.4°C | 9.4°C | 15 | 3.0 | 11.912 h |
| April | 25.5°C12.6°C | 12.6°C | 5.0 | 1.4 | 13.113 h |
| May | 30.7°C17.5°C | 17.5°C | 2.6 | 0.8 | 14.114 h |
| June | 36.6°C22.6°C | 22.6°C | 1.4 | 0.3 | 14.615 h |
| July | 39.3°C26.5°C | 26.5°C | 7.1 | 2.3 | 14.314 h |
| August | 38.3°C25.8°C | 25.8°C | 10 | 2.5 | 13.514 h |
| September, selected | 34.1°C21.7°C | 21.7°C | 6.5 | 1.3 | 12.412 h |
| October | 26.8°C15.4°C | 15.4°C | 8.0 | 1.3 | 11.311 h |
| November | 19.2°C9.4°C | 9.4°C | 10 | 1.4 | 10.310 h |
| December | 13.7°C5.2°C | 5.2°C | 17 | 2.5 | 9.810 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
- Paradise in SeptemberUnited States · 16 kmHigh 33.6°C · Low 20.9°C · 7.8 mm rain
- Las Vegas in SeptemberUnited States · 21 kmHigh 33.4°C · Low 21.0°C · 7.2 mm rain
- Enterprise in SeptemberUnited States · 23 kmHigh 32.4°C · Low 19.8°C · 7.8 mm rain
- Spring Valley in SeptemberUnited States · 25 kmHigh 33.0°C · Low 20.0°C · 7.8 mm rain
- Saint George in SeptemberUnited States · 172 kmHigh 31.2°C · Low 19.2°C · 20 mm rain
- Apple Valley in SeptemberUnited States · 263 kmHigh 31.0°C · Low 17.1°C · 4.2 mm rain
- Victorville in SeptemberUnited States · 268 kmHigh 31.8°C · Low 17.6°C · 4.2 mm rain
- Hesperia in SeptemberUnited States · 277 kmHigh 30.5°C · Low 16.5°C · 4.2 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 Henderson) is explained once on the Henderson year overview and on the Sources, method and limits page.