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Stillwater (OK)
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Stillwater (OK)
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United States weather

Weather in Stillwater, Oklahoma for September 2025

Your guide to Stillwater weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Stillwater is slightly cooler than the historical average by -1.1 °F.

  • The forecast for the upcoming days in Stillwater predicts a temperature of 32.6 °F, which is slightly above the historical average.

  • In general, the average temperature in Stillwater at the beginning of September is 28.3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 32.7 °F by the end of September.

    • Rain 🌧️

  • Stillwater experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 51.9 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
24
Dry days
Average rainy days
6
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

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
31°
2
Sunny
29°
3
Overcast
28°
4
Overcast
29°
5
Overcast
26°
6
Cloudy
29°
7
Partly cloudy
26°
8
Sunny
28°
9
Sunny
28°
10
Sunny
29°
11
Partly cloudy
34°
12
Partly cloudy
34°
13
Sunny
34°
14
Moderate or heavy rain shower
31°
15
Patchy rain possible
33°
16
Overcast
34°
17
Sunny
36°
18
Patchy rain possible
32°
19
Partly cloudy
33°
20
Patchy rain possible
34°
21
Heavy rain
36°
22
Moderate rain
26°
23
Patchy rain possible
30°
24
Patchy rain possible
31°
25
Sunny
32°
26
Sunny
32°
27
Sunny
31°
28
Sunny
32°
29
Sunny
37°
30
Patchy rain possible
34°

Temperatures trend during September in Stillwater

See the weather trend as well as the moving average line

September weather in Stillwater day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 31° /19° 9.8 mm 7
Sept. 2 Sunny
Sunny
 29° /19° 1.6 mm 7
Sept. 3 Overcast
Overcast
 28° /18° 0 mm 7
Sept. 4 Overcast
Overcast
 29° /19° 0 mm 7
Sept. 5 Overcast
Overcast
 26° /17° 0 mm 6
Sept. 6 Cloudy
Cloudy
 29° /16° 0 mm 7
Sept. 7 Partly cloudy
Partly cloudy
 26° /15° 0 mm 6
Sept. 8 Sunny
Sunny
 28° /14° 0 mm 7
Sept. 9 Sunny
Sunny
 28° /15° 16.5 mm 7
Sept. 10 Sunny
Sunny
 29° /16° 5.2 mm 7
Sept. 11 Partly cloudy
Partly cloudy
 34° /16° 0 mm 8
Sept. 12 Partly cloudy
Partly cloudy
 34° /18° 0 mm 8
Sept. 13 Sunny
Sunny
 34° /18° 0 mm 8
Sept. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 31° /19° 1.6 mm 7
Sept. 15 Patchy rain possible
Patchy rain possible
 33° /19° 0.1 mm 8
Sept. 16 Overcast
Overcast
 34° /19° 0 mm 8
Sept. 17 Sunny
Sunny
 36° /18° 0 mm 1.5
Sept. 18 Patchy rain possible
Patchy rain possible
 32° /19° 0.5 mm 1.3
Sept. 19 Partly cloudy
Partly cloudy
 33° /18° 0 mm 1.7
Sept. 20 Patchy rain possible
Patchy rain possible
 34° /19° 0.2 mm 1.6
Sept. 21 Heavy rain
Heavy rain
 36° /20° 21.4 mm 0
Sept. 22 Moderate rain
Moderate rain
 26° /19° 9.2 mm 5
Sept. 23 Patchy rain possible
Patchy rain possible
 30° /19° 0.1 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 31° /22° 0.2 mm 6
Sept. 25 Sunny
Sunny
 32° /18° 0 mm 6
Sept. 26 Sunny
Sunny
 32° /21° 0 mm 7
Sept. 27 Sunny
Sunny
 31° /20° 0 mm 6
Sept. 28 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 29 Sunny
Sunny
 37° /23° 0 mm 7
Sept. 30 Patchy rain possible
Patchy rain possible
 34° /22° 2.1 mm 6
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 ☀️

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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