Climate averages 1991–2020
Dallas weather
in September.
A hot, moderately wet month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Dallas: daytime highs average 30.7°C and nights cool to about 21.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 63 mm of rain on roughly 6 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 24 min on an average September day.
The nearest other city in this atlas is Irving (14 km away). In September its highs average 30.7°C, about as warm as Dallas, with 64 mm of rain.
Among the 498 cities listed in the United States, Dallas ranks joint 75th of 498 for the warmest September highs and joint 182nd of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Dallas is 3.8°C warmer than that mean.
From September to October, average highs fall by 5.5°C to 25.2°C, and monthly rainfall rises from 63 mm to 97 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
Dallas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.2°C3.8°C | 3.8°C | 71 | 7.1 | 10.310 h |
| February | 15.6°C5.7°C | 5.7°C | 76 | 7.7 | 11.011 h |
| March | 19.7°C9.6°C | 9.6°C | 100 | 9.5 | 12.012 h |
| April | 24.0°C13.9°C | 13.9°C | 107 | 8.8 | 13.013 h |
| May | 27.9°C18.7°C | 18.7°C | 127 | 10.6 | 13.814 h |
| June | 31.9°C23.0°C | 23.0°C | 83 | 8.4 | 14.314 h |
| July | 34.5°C25.3°C | 25.3°C | 41 | 5.7 | 14.114 h |
| August | 34.5°C25.4°C | 25.4°C | 53 | 5.4 | 13.413 h |
| September, selected | 30.7°C21.5°C | 21.5°C | 63 | 5.9 | 12.412 h |
| October | 25.2°C15.6°C | 15.6°C | 97 | 7.7 | 11.411 h |
| November | 18.8°C9.6°C | 9.6°C | 88 | 7.2 | 10.511 h |
| December | 14.1°C5.0°C | 5.0°C | 89 | 6.9 | 10.010 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
- Irving in SeptemberUnited States · 14 kmHigh 30.7°C · Low 21.5°C · 64 mm rain
- Grand Prairie in SeptemberUnited States · 18 kmHigh 30.7°C · Low 21.4°C · 64 mm rain
- Mesquite in SeptemberUnited States · 19 kmHigh 30.6°C · Low 21.3°C · 64 mm rain
- Richardson in SeptemberUnited States · 20 kmHigh 30.2°C · Low 21.1°C · 71 mm rain
- Carrollton in SeptemberUnited States · 21 kmHigh 30.4°C · Low 21.4°C · 72 mm rain
- Garland in SeptemberUnited States · 21 kmHigh 30.3°C · Low 21.1°C · 71 mm rain
- Plano in SeptemberUnited States · 28 kmHigh 30.1°C · Low 21.0°C · 71 mm rain
- Arlington (Texas), United States in SeptemberUnited States · 29 kmHigh 30.6°C · Low 21.2°C · 64 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 Dallas) is explained once on the Dallas year overview and on the Sources, method and limits page.