Climate averages 1991–2020
Norman weather
in September.
A hot, moderately wet month: the 4th warmest and the 7th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Norman: daytime highs average 28.6°C and nights cool to about 19.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 73 mm of rain on roughly 7 days, which makes September a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Oklahoma City (28 km away). In September its highs average 28.5°C, about as warm as Norman, with 73 mm of rain.
Among the 498 cities listed in the United States, Norman ranks joint 188th of 498 for the warmest September highs and joint 235th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Norman is 1.7°C warmer than that mean.
From September to October, average highs fall by 6.2°C to 22.4°C, and monthly rainfall rises from 73 mm to 76 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
Norman climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.3°C0.1°C | 0.1°C | 37 | 4.7 | 10.110 h |
| February | 12.0°C1.9°C | 1.9°C | 46 | 5.7 | 10.911 h |
| March | 16.8°C6.6°C | 6.6°C | 74 | 7.7 | 11.912 h |
| April | 21.7°C11.3°C | 11.3°C | 100 | 8.6 | 13.113 h |
| May | 26.1°C16.6°C | 16.6°C | 113 | 10.7 | 14.014 h |
| June | 30.7°C21.6°C | 21.6°C | 95 | 9.0 | 14.514 h |
| July | 33.6°C24.1°C | 24.1°C | 55 | 6.2 | 14.314 h |
| August | 33.2°C23.8°C | 23.8°C | 57 | 6.5 | 13.513 h |
| September, selected | 28.6°C19.4°C | 19.4°C | 73 | 6.6 | 12.412 h |
| October | 22.4°C13.1°C | 13.1°C | 76 | 7.0 | 11.311 h |
| November | 15.5°C6.7°C | 6.7°C | 50 | 5.8 | 10.410 h |
| December | 10.0°C1.5°C | 1.5°C | 48 | 5.1 | 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
- Oklahoma City in SeptemberUnited States · 28 kmHigh 28.5°C · Low 18.9°C · 73 mm rain
- Edmond in SeptemberUnited States · 48 kmHigh 28.6°C · Low 18.9°C · 70 mm rain
- Lawton in SeptemberUnited States · 110 kmHigh 29.7°C · Low 19.7°C · 65 mm rain
- Tulsa in SeptemberUnited States · 167 kmHigh 28.3°C · Low 19.1°C · 101 mm rain
- Wichita Falls in SeptemberUnited States · 175 kmHigh 30.6°C · Low 20.6°C · 65 mm rain
- Broken Arrow in SeptemberUnited States · 175 kmHigh 28.1°C · Low 19.0°C · 101 mm rain
- Denton in SeptemberUnited States · 225 kmHigh 30.0°C · Low 21.0°C · 77 mm rain
- Frisco in SeptemberUnited States · 237 kmHigh 29.9°C · Low 20.8°C · 81 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 Norman) is explained once on the Norman year overview and on the Sources, method and limits page.