Climate averages 1991–2020
Las Vegas weather
in September.
A 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 hot month in Las Vegas: daytime highs average 33.4°C and nights cool to about 21.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 7.2 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 (9 km away). In September its highs average 33.6°C, about as warm as Las Vegas, with 7.8 mm of rain.
Among the 498 cities listed in the United States, Las Vegas ranks 17th of 498 for the warmest September highs and 100th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Las Vegas is 6.5°C warmer than that mean.
From September to October, average highs fall by 7.3°C to 26.1°C, and monthly rainfall rises from 7.2 mm to 8.2 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
Las Vegas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.7°C3.7°C | 3.7°C | 22 | 3.7 | 10.010 h |
| February | 15.9°C5.1°C | 5.1°C | 30 | 4.8 | 10.811 h |
| March | 20.5°C8.5°C | 8.5°C | 16 | 3.5 | 11.912 h |
| April | 24.9°C11.9°C | 11.9°C | 7.3 | 2.2 | 13.113 h |
| May | 30.1°C16.8°C | 16.8°C | 5.4 | 1.5 | 14.114 h |
| June | 35.9°C22.2°C | 22.2°C | 1.8 | 0.4 | 14.615 h |
| July | 38.7°C26.1°C | 26.1°C | 7.0 | 2.2 | 14.414 h |
| August | 37.6°C25.4°C | 25.4°C | 9.7 | 2.0 | 13.514 h |
| September, selected | 33.4°C21.0°C | 21.0°C | 7.2 | 1.1 | 12.412 h |
| October | 26.1°C14.4°C | 14.4°C | 8.2 | 1.6 | 11.311 h |
| November | 18.4°C8.1°C | 8.1°C | 10 | 1.5 | 10.310 h |
| December | 12.8°C3.4°C | 3.4°C | 21 | 3.3 | 9.710 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 · 9 kmHigh 33.6°C · Low 20.9°C · 7.8 mm rain
- Spring Valley in SeptemberUnited States · 12 kmHigh 33.0°C · Low 20.0°C · 7.8 mm rain
- Enterprise in SeptemberUnited States · 19 kmHigh 32.4°C · Low 19.8°C · 7.8 mm rain
- Henderson in SeptemberUnited States · 21 kmHigh 34.1°C · Low 21.7°C · 6.5 mm rain
- Saint George in SeptemberUnited States · 173 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 · 267 kmHigh 31.8°C · Low 17.6°C · 4.2 mm rain
- Hesperia in SeptemberUnited States · 276 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 Las Vegas) is explained once on the Las Vegas year overview and on the Sources, method and limits page.