Stillwater (OK)
September
Weather in Stillwater, Oklahoma for September 2026
Your guide to Stillwater weather in September - trends and predictions
In general, the average temperature in Stillwater at the beginning of September is 28.3 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 28.6 °F by the end of September.
Stillwater experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 51.9 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
31°/18°
Temperatures
19 km/h
Avg max wind
54 %
Avg humidity
Stillwater Weather September
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Temperatures trend during September in Stillwater
See the weather trend as well as the moving average line
September weather in Stillwater day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /19° | 9.8 mm | 7 | |
| Sept. 2 | Sunny | 29° /19° | 1.6 mm | 7 | |
| Sept. 3 |  Overcast | 28° /18° | 0 mm | 7 | |
| Sept. 4 | Overcast | 29° /19° | 0 mm | 7 | |
| Sept. 5 | Overcast | 26° /17° | 0 mm | 6 | |
| Sept. 6 |  Cloudy | 29° /16° | 0 mm | 7 | |
| Sept. 7 |  Partly cloudy | 26° /15° | 0 mm | 6 | |
| Sept. 8 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 9 | Sunny | 28° /15° | 16.5 mm | 7 | |
| Sept. 10 | Sunny | 29° /16° | 5.2 mm | 7 | |
| Sept. 11 | Partly cloudy | 34° /16° | 0 mm | 8 | |
| Sept. 12 | Partly cloudy | 34° /18° | 0 mm | 8 | |
| Sept. 13 | Sunny | 34° /18° | 0 mm | 8 | |
| Sept. 14 |  Moderate or heavy rain shower | 31° /19° | 1.6 mm | 7 | |
| Sept. 15 |  Patchy rain possible | 33° /19° | 0.1 mm | 8 | |
| Sept. 16 | Overcast | 34° /19° | 0 mm | 8 | |
| Sept. 17 | Overcast | 33° /20° | 0 mm | 7 | |
| Sept. 18 | Overcast | 33° /20° | 9.4 mm | 7 | |
| Sept. 19 |  Heavy rain at times | 36° /21° | 0.6 mm | 8 | |
| Sept. 20 | Cloudy | 37° /21° | 0.5 mm | 9 | |
| Sept. 21 | Partly cloudy | 30° /22° | 3.6 mm | 7 | |
| Sept. 22 | Moderate or heavy rain shower | 31° /18° | 9.3 mm | 8 | |
| Sept. 23 | Moderate or heavy rain shower | 24° /16° | 41.8 mm | 5 | |
| Sept. 24 | Moderate or heavy rain shower | 25° /15° | 10.8 mm | 6 | |
| Sept. 25 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 26 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 27 | Sunny | 29° /13° | 0 mm | 8 | |
| Sept. 28 | Overcast | 31° /16° | 0 mm | 7 | |
| Sept. 29 | Partly cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 30 |  Mist | 30° /15° | 0 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Stillwater in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Stillwater forecast closer to your planned date for the most up-to-date weather information.
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Stillwater in September - FAQ
What are the expected maximum and minimum temperatures in Stillwater during September?
Expect warm days with temperatures around 31°, cooling to mild conditions of 18° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Stillwater during September?
Moderate rainfall is anticipated in Stillwater during September, with a total of 51.9 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Stillwater during September?
The average wind speed in Stillwater during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Stillwater
Explore the daily rainfall trends and prepare for Stillwaters September weather 💧
UV exposure in Stillwater during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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