Climate averages 1991–2020
Durham weather
in September.
A warm, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Durham: daytime highs average 26.9°C and nights cool to about 17.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 112 mm of rain on roughly 9 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Cary (25 km away). In September its highs average 26.6°C, about as warm as Durham, with 120 mm of rain.
Among the 498 cities listed in the United States, Durham ranks joint 244th of 498 for the warmest September highs and joint 431st of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Durham is level with that mean.
From September to October, average highs fall by 5.4°C to 21.4°C, and monthly rainfall falls from 112 mm to 79 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
Durham climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.5°C0.1°C | 0.1°C | 92 | 9.4 | 10.010 h |
| February | 11.6°C1.2°C | 1.2°C | 81 | 8.9 | 10.911 h |
| March | 15.8°C4.6°C | 4.6°C | 108 | 10.5 | 11.912 h |
| April | 21.1°C9.7°C | 9.7°C | 89 | 9.3 | 13.113 h |
| May | 25.4°C14.7°C | 14.7°C | 88 | 10.6 | 14.114 h |
| June | 29.4°C19.4°C | 19.4°C | 98 | 12.0 | 14.615 h |
| July | 31.4°C21.9°C | 21.9°C | 110 | 14.9 | 14.314 h |
| August | 30.2°C21.0°C | 21.0°C | 99 | 11.6 | 13.514 h |
| September, selected | 26.9°C17.9°C | 17.9°C | 112 | 9.4 | 12.412 h |
| October | 21.4°C11.6°C | 11.6°C | 79 | 7.5 | 11.311 h |
| November | 15.5°C5.6°C | 5.6°C | 85 | 7.7 | 10.310 h |
| December | 11.1°C1.9°C | 1.9°C | 89 | 9.1 | 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
- Cary in SeptemberUnited States · 25 kmHigh 26.6°C · Low 18.2°C · 120 mm rain
- Raleigh in SeptemberUnited States · 34 kmHigh 26.9°C · Low 18.4°C · 120 mm rain
- Greensboro in SeptemberUnited States · 81 kmHigh 26.2°C · Low 17.1°C · 105 mm rain
- High Point in SeptemberUnited States · 100 kmHigh 26.3°C · Low 17.1°C · 105 mm rain
- Fayetteville in SeptemberUnited States · 105 kmHigh 27.6°C · Low 19.0°C · 128 mm rain
- Winston-Salem in SeptemberUnited States · 122 kmHigh 26.4°C · Low 17.0°C · 101 mm rain
- Greenville in SeptemberUnited States · 145 kmHigh 27.0°C · Low 19.0°C · 132 mm rain
- Lynchburg in SeptemberUnited States · 159 kmHigh 26.0°C · Low 16.6°C · 104 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 Durham) is explained once on the Durham year overview and on the Sources, method and limits page.