Climate averages 1991–2020
Saint George weather
in September.
A hot, fairly dry month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Saint George: daytime highs average 31.2°C and nights cool to about 19.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 20 mm of rain on roughly 3 days, which makes September a fairly dry month (the 6th 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 Henderson (172 km away). In September its highs average 34.1°C, 2.8°C warmer than Saint George, with 6.5 mm of rain.
Among the 498 cities listed in the United States, Saint George ranks 52nd of 498 for the warmest September highs and joint 119th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Saint George is 4.4°C warmer than that mean.
From September to October, average highs fall by 7.4°C to 23.8°C, and monthly rainfall rises from 20 mm to 25 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
Saint George climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.4°C0.1°C | 0.1°C | 35 | 5.1 | 9.910 h |
| February | 12.8°C1.9°C | 1.9°C | 42 | 6.2 | 10.811 h |
| March | 17.6°C5.8°C | 5.8°C | 34 | 5.6 | 11.912 h |
| April | 22.3°C9.9°C | 9.9°C | 18 | 3.0 | 13.113 h |
| May | 28.1°C15.7°C | 15.7°C | 8.5 | 2.1 | 14.114 h |
| June | 34.2°C21.7°C | 21.7°C | 3.2 | 0.5 | 14.715 h |
| July | 36.8°C25.9°C | 25.9°C | 9.7 | 2.1 | 14.414 h |
| August | 35.6°C24.8°C | 24.8°C | 14 | 2.8 | 13.614 h |
| September, selected | 31.2°C19.2°C | 19.2°C | 20 | 2.7 | 12.512 h |
| October | 23.8°C11.8°C | 11.8°C | 25 | 3.4 | 11.311 h |
| November | 16.1°C4.9°C | 4.9°C | 22 | 3.2 | 10.210 h |
| December | 9.9°C0.2°C | 0.2°C | 28 | 4.8 | 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
- Henderson in SeptemberUnited States · 172 kmHigh 34.1°C · Low 21.7°C · 6.5 mm rain
- Las Vegas in SeptemberUnited States · 173 kmHigh 33.4°C · Low 21.0°C · 7.2 mm rain
- Paradise in SeptemberUnited States · 179 kmHigh 33.6°C · Low 20.9°C · 7.8 mm rain
- Spring Valley in SeptemberUnited States · 185 kmHigh 33.0°C · Low 20.0°C · 7.8 mm rain
- Enterprise in SeptemberUnited States · 191 kmHigh 32.4°C · Low 19.8°C · 7.8 mm rain
- Flagstaff in SeptemberUnited States · 274 kmHigh 23.3°C · Low 12.4°C · 57 mm rain
- Provo in SeptemberUnited States · 386 kmHigh 24.2°C · Low 13.1°C · 28 mm rain
- Orem in SeptemberUnited States · 391 kmHigh 24.4°C · Low 12.5°C · 28 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 Saint George) is explained once on the Saint George year overview and on the Sources, method and limits page.