Fort Smith, AR weather in September
Fort Smith is warm and often humid in September, with some rain: highs average 87°F and nights drop to about 63°F. Rain falls on about 7 days.
- Normal high
- 87°F
- Normal low
- 63°F
- Wet days
- 7
- 4.0 in total
- Muggy days
- 13
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 91°F | 82°F |
| Normal low | 68°F | 57°F |
| Chance of a wet day | 24% | 23% |
| Sunrise / sunset | 6:50 am / 7:45 pm | 7:11 am / 7:03 pm |
| Daylight | 12.9 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am65°Fdew point 62°F
- 9 am73°Fdew point 63°F
- Noon81°Fdew point 62°F
- 3 pm84°Fdew point 61°F
- 6 pm80°Fdew point 62°F
- 9 pm73°Fdew point 63°F
NOAA hourly normals (local standard time) from Ft Smith Rgnl Airport (4 mi away); average wind 6 mph; clear or few clouds in 68% of daytime hours, mostly cloudy or overcast in 25%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 30
- Hot dayshigh 90°F or more11 of 30
- Muggy daysdaily mean dew point 65°F or more13 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.0 in; a dry September brings about 1.8 in and a wet one about 6.1 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202005: average high 92°F
- Coolest September1995: average high 80°F
- Wettest September2008: 8.1 in
- Driest September2017: no measurable precipitation
- Highest reading109°F (September 3, 2000)
- Lowest reading40°F (September 30, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 94°F | 87°F | 76°F |
| Normal low | 71°F | 63°F | 51°F |
| Wet days | 7 | 7 | 8 |
| Comfortable days | 0 | 4 | 14 |
| Daylight | 13.5 h | 12.4 h | 11.3 h |
Highs change by -7°F from August and -11°F into October.
Nearby alternatives in September
- Cooler: Fayetteville, AR49 mi · high 82°F · 9 wet days
How Fort Smith ranks in September
- Normal high124th warmest of 378 cities; 1st of 4 in Arkansas
- Wet days152nd driest of 378
- Comfortable days221st most of 342
What to pack for Fort Smith in September
- Light, breathable clothing – highs near 87°F and about 13 muggy days
Heating and cooling
September has 10 heating degree days and 304 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How hot is Fort Smith in September?
The normal high is 87°F and the normal low is 63°F. From 1991 to 2020 the hottest September reading was 109°F (most recently on September 3, 2000).
Does it rain a lot in Fort Smith in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 4.0 in. The wettest September in 1991-2020 was in 2008 (8.1 in); the driest was in 2017, with no measurable precipitation.
Is September a good time to visit Fort Smith?
September ranks 7th of 12 months on our comfort score for Fort Smith (47 out of 100). It has about 4 comfortable days and about 11 days at 90°F or hotter. The best month is April.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Ft Smith Rgnl Airport (USW00013964), 4.2 mi SSE of the city center, 449 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Fort Smith Regional Airport (723440-13964), 4.1 mi SSE of the city center, 448 ft . Hourly observations, 1991-2020.