Climate averages 1991–2020
Fort Smith weather
in September.
A hot, wet month: the 4th warmest and the 6th 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 Fort Smith: daytime highs average 28.9°C and nights cool to about 18.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 93 mm of rain on roughly 7 days, which makes September a wet month (the 6th 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 Fayetteville, United States (78 km away). In September its highs average 26.7°C, 2.2°C cooler than Fort Smith, with 97 mm of rain.
Among the 498 cities listed in the United States, Fort Smith ranks joint 175th of 498 for the warmest September highs and joint 358th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Fort Smith is 2.0°C warmer than that mean.
From September to October, average highs fall by 6.1°C to 22.7°C, and monthly rainfall rises from 93 mm to 108 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
Fort Smith climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.5°C-0.1°C | -0.1°C | 84 | 8.9 | 10.110 h |
| February | 12.3°C1.8°C | 1.8°C | 85 | 8.5 | 10.911 h |
| March | 17.0°C6.0°C | 6.0°C | 125 | 11.3 | 11.912 h |
| April | 21.6°C10.7°C | 10.7°C | 149 | 11.3 | 13.113 h |
| May | 25.9°C16.0°C | 16.0°C | 148 | 12.9 | 14.014 h |
| June | 30.5°C20.8°C | 20.8°C | 92 | 10.3 | 14.515 h |
| July | 33.0°C23.1°C | 23.1°C | 78 | 8.8 | 14.314 h |
| August | 32.8°C22.7°C | 22.7°C | 63 | 8.3 | 13.513 h |
| September, selected | 28.9°C18.6°C | 18.6°C | 93 | 7.4 | 12.412 h |
| October | 22.7°C12.4°C | 12.4°C | 108 | 9.0 | 11.311 h |
| November | 15.9°C6.2°C | 6.2°C | 110 | 8.7 | 10.310 h |
| December | 10.7°C1.6°C | 1.6°C | 96 | 8.9 | 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
- Fayetteville, United States in SeptemberUnited States · 78 kmHigh 26.7°C · Low 17.2°C · 97 mm rain
- Springdale in SeptemberUnited States · 92 kmHigh 26.7°C · Low 17.3°C · 97 mm rain
- Broken Arrow in SeptemberUnited States · 146 kmHigh 28.1°C · Low 19.0°C · 101 mm rain
- Tulsa in SeptemberUnited States · 167 kmHigh 28.3°C · Low 19.1°C · 101 mm rain
- Little Rock in SeptemberUnited States · 205 kmHigh 29.0°C · Low 19.5°C · 89 mm rain
- Springfield (Missouri), United States in SeptemberUnited States · 226 kmHigh 26.2°C · Low 16.4°C · 98 mm rain
- Norman in SeptemberUnited States · 277 kmHigh 28.6°C · Low 19.4°C · 73 mm rain
- Edmond in SeptemberUnited States · 280 kmHigh 28.6°C · Low 18.9°C · 70 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 Fort Smith) is explained once on the Fort Smith year overview and on the Sources, method and limits page.