Stanislaus County (Modesto)
September
Weather in Stanislaus County, California for September 2025
Your guide to Stanislaus County weather in September - trends and predictions
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Until now, September 2025 in Stanislaus County is slightly cooler than the historical average by -1.7 °F.
The forecast for the next days in Stanislaus County predicts a temperature of 29.9 °F, which is cooler than the historical average.
In general, the average temperature in Stanislaus County at the beginning of September is 36 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.4 °F by the end of September.
Precipitation in Stanislaus County during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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29
Dry days
1
Rainy days
0
Snow days
33°/14°
Temperatures
18 km/h
Avg max wind
45 %
Avg humidity
Stanislaus County Weather September
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Temperatures trend during September in Stanislaus County
See the weather trend as well as the moving average line
September weather in Stanislaus County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 36° /15° | 0 mm | 8 | |
| Sept. 2 | Sunny | 34° /14° | 0 mm | 8 | |
| Sept. 3 | Sunny | 35° /15° | 0.1 mm | 8 | |
| Sept. 4 | Sunny | 37° /15° | 0 mm | 9 | |
| Sept. 5 | Sunny | 37° /15° | 0 mm | 8 | |
| Sept. 6 | Sunny | 37° /16° | 0 mm | 9 | |
| Sept. 7 | Sunny | 36° /15° | 0 mm | 9 | |
| Sept. 8 | Sunny | 35° /15° | 0 mm | 8 | |
| Sept. 9 |  Partly cloudy | 35° /15° | 0 mm | 8 | |
| Sept. 10 | Sunny | 33° /14° | 0 mm | 8 | |
| Sept. 11 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 12 |  Cloudy | 32° /12° | 0 mm | 7 | |
| Sept. 13 | Sunny | 34° /13° | 0 mm | 8 | |
| Sept. 14 | Sunny | 35° /14° | 0 mm | 8 | |
| Sept. 15 | Sunny | 34° /14° | 0 mm | 8 | |
| Sept. 16 | Sunny | 32° /14° | 0.1 mm | 8 | |
| Sept. 17 | Sunny | 41° /18° | 0 mm | 1.7 | |
| Sept. 18 |  Overcast | 33° /20° | 0 mm | 1.2 | |
| Sept. 19 |  Heavy rain | 31° /19° | 29.3 mm | 1.1 | |
| Sept. 20 | Sunny | 33° /17° | 0 mm | 1.6 | |
| Sept. 21 | Sunny | 36° /18° | 0 mm | 1.6 | |
| Sept. 22 | Sunny | 37° /20° | 0 mm | 0 | |
| Sept. 23 | Partly cloudy | 22° /16° | 0.1 mm | 5 | |
| Sept. 24 | Sunny | 28° /14° | 0 mm | 5 | |
| Sept. 25 | Sunny | 29° /14° | 0 mm | 5 | |
| Sept. 26 |  Patchy rain possible | 24° /14° | 0.9 mm | 4 | |
| Sept. 27 | Patchy rain possible | 24° /14° | 0.5 mm | 4 | |
| Sept. 28 | Sunny | 25° /13° | 0 mm | 5 | |
| Sept. 29 | Sunny | 27° /14° | 0 mm | 5 | |
| Sept. 30 | Sunny | 28° /15° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Stanislaus County 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 Stanislaus County forecast closer to your planned date for the most up-to-date weather information.
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Stanislaus County in September - FAQ
What are the expected maximum and minimum temperatures in Stanislaus County during September?
Expect warm days with temperatures around 33°, cooling to mild conditions of 14° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Stanislaus County during September?
Rainfall in Stanislaus County during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Stanislaus County during September?
The average wind speed in Stanislaus County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Stanislaus County
Explore the daily rainfall trends and prepare for Stanislaus Countys September weather 💧
UV exposure in Stanislaus County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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