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Weather in Stillwater, Oklahoma for September 2025

Your guide to Stillwater weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Stillwater at the beginning of September is 29.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.6 °F by the end of September.

  • Rain 🌧️

  • Stillwater experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 51.9 mm.

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Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/18°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
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
Sunny
33° /21° 0 mm 8
Sept. 2 Sunny
Sunny
30° /20° 0 mm 8
Sept. 3 Overcast
Overcast
25° /20° 0 mm 6
Sept. 4 Overcast
Overcast
28° /19° 0 mm 6
Sept. 5 Overcast
Overcast
30° /19° 0 mm 7
Sept. 6 Cloudy
Cloudy
32° /20° 0 mm 7
Sept. 7 Partly cloudy
Partly cloudy
28° /17° 0 mm 7
Sept. 8 Sunny
Sunny
29° /15° 0 mm 7
Sept. 9 Sunny
Sunny
30° /15° 0 mm 8
Sept. 10 Sunny
Sunny
32° /15° 0 mm 8
Sept. 11 Partly cloudy
Partly cloudy
33° /17° 0 mm 8
Sept. 12 Partly cloudy
Partly cloudy
32° /19° 0 mm 8
Sept. 13 Sunny
Sunny
33° /18° 0 mm 8
Sept. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
33° /17° 3.2 mm 7
Sept. 15 Patchy rain possible
Patchy rain possible
33° /19° 0.2 mm 7
Sept. 16 Overcast
Overcast
32° /18° 0 mm 7
Sept. 17 Overcast
Overcast
31° /20° 0 mm 7
Sept. 18 Overcast
Overcast
34° /20° 0 mm 7
Sept. 19 Heavy rain at times
Heavy rain at times
38° /23° 1.2 mm 8
Sept. 20 Cloudy
Cloudy
38° /23° 1 mm 8
Sept. 21 Partly cloudy
Partly cloudy
36° /24° 0.4 mm 9
Sept. 22 Moderate or heavy rain shower
Moderate or heavy rain shower
27° /16° 13.7 mm 6
Sept. 23 Moderate or heavy rain shower
Moderate or heavy rain shower
24° /15° 14 mm 5
Sept. 24 Moderate or heavy rain shower
Moderate or heavy rain shower
26° /13° 18.2 mm 6
Sept. 25 Sunny
Sunny
28° /15° 0 mm 7
Sept. 26 Sunny
Sunny
27° /12° 0 mm 7
Sept. 27 Sunny
Sunny
28° /13° 0 mm 7
Sept. 28 Overcast
Overcast
29° /15° 0 mm 6
Sept. 29 Partly cloudy
Partly cloudy
30° /15° 0 mm 8
Sept. 30 Mist
Mist
32° /14° 0 mm 7
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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.

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 7 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 ☀️

Quick links

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Location coordinates 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.

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