Fort Smith Weather Forecast
- 69
- 93
Chance Thunderstorms
- 68
- 86
Chance Thunderstorms
- 70
- 88
Chance Thunderstorms
- 70
- 86
Chance Thunderstorms
- 69
- 84
Chance Thunderstorms
- 67
- 86
Slight Chance Thunderstorms
Today 18 Sep Sebastian
Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. Highs in the lower 90s. Temperature falling into the mid 80s in the afternoon. Southeast Winds around 5 Mph, becoming southwest around 5 Mph in the afternoon. Chance of rain 40 percent.
Tonight 18 Sep Sebastian
Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the upper 60s. North Winds around 5 Mph, becoming southwest after midnight. Chance of rain 50 percent.
Fort Smith Temperature Statistics
September Temperature
Fort Smith Regional Airport (3.7 miles)
Lowest 7 September, 2025
55.9 °FAverage September
75.8 °FHighest 15 September, 2025
96.1 °F
Climate (2020–Present)
Fort Smith Regional Airport (3.7 miles)
Average Low 2020–2025
53.5 °FAverage 2020–2025
63.8 °FAverage High 2020–2025
75.1 °F