Weather in Stillwater, Oklahoma for September 2026
So far, September 2026 in Stillwater shows a warmer trend than usual by 2.7 °F.
An exceptional deviation from the historical average is forecasted for next days of September 2026 in Stillwater with the forecasted temperature being 24.7 °F, much lower than usual.
In general, the average temperature in Stillwater at the beginning of September is 31.7 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 29.4 °F by the end of September.
Stillwater experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 110.8 mm.
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Stillwater Weather September
Temperatures trend during September in Stillwater
September weather in Stillwater day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 34° /20° | 6.5 mm | 8 | |
| Sept. 2 | Sunny | 32° /20° | 1.1 mm | 8 | |
| Sept. 3 |  Overcast | 31° /20° | 0 mm | 7 | |
| Sept. 4 | Overcast | 32° /20° | 0 mm | 7 | |
| Sept. 5 | Overcast | 30° /19° | 0 mm | 7 | |
| Sept. 6 |  Cloudy | 32° /19° | 0 mm | 7 | |
| Sept. 7 |  Partly cloudy | 31° /18° | 0 mm | 7 | |
| Sept. 8 | Sunny | 32° /17° | 0 mm | 7 | |
| Sept. 9 | Sunny | 32° /18° | 11.7 mm | 8 | |
| Sept. 10 | Sunny | 29° /18° | 5.5 mm | 5 | |
| Sept. 11 | Partly cloudy | 34° /17° | 0 mm | 8 | |
| Sept. 12 | Partly cloudy | 35° /19° | 2.3 mm | 8 | |
| Sept. 13 | Sunny | 34° /19° | 0.7 mm | 7 | |
| Sept. 14 |  Moderate or heavy rain shower | 33° /21° | 1.1 mm | 7 | |
| Sept. 15 |  Patchy rain possible | 35° /21° | 0.1 mm | 8 | |
| Sept. 16 | Overcast | 35° /21° | 0 mm | 7 | |
| Sept. 17 | Overcast | 34° /22° | 0 mm | 7 | |
| Sept. 18 | Overcast | 34° /21° | 6.3 mm | 7 | |
| Sept. 19 |  Heavy rain at times | 36° /22° | 0.9 mm | 8 | |
| Sept. 20 | Cloudy | 35° /21° | 0.5 mm | 6 | |
| Sept. 21 | Partly cloudy | 30° /21° | 3 mm | 6 | |
| Sept. 22 | Moderate or heavy rain shower | 30° /18° | 6.2 mm | 7 | |
| Sept. 23 | Moderate or heavy rain shower | 26° /16° | 27.9 mm | 4 | |
| Sept. 24 | Moderate or heavy rain shower | 27° /17° | 7.2 mm | 4 | |
| Sept. 25 | Sunny | 29° /16° | 2 mm | 5 | |
| Sept. 26 | Sunny | 29° /15° | 2.2 mm | 5 | |
| Sept. 27 | Sunny | 29° /15° | 0.3 mm | 6 | |
| Sept. 28 | Overcast | 31° /17° | 0.3 mm | 7 | |
| Sept. 29 | Overcast | 32° /22° | 0.5 mm | 5.1 | |
| Sept. 30 | Overcast | 29° /22° | 3.5 mm | 5.9 | |
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Stillwater in September - FAQ
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September rainfall patterns in Stillwater
UV exposure in Stillwater during September
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Where is Stillwater?Get accurate weather forecasts for Stillwater, located at latitude 36.116 and longitude -97.058. Stay updated with localized weather information tailored for Stillwater.