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Stanislaus County (Modesto)
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United States weather

Weather in Stanislaus County, California for September 2026

Your guide to Stanislaus County weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Stanislaus County is slightly cooler than the historical average by 1 °F.

  • The forecast for the upcoming days in Stanislaus County predicts a temperature of 33.4 °F, which is slightly above the historical average.

  • In general, the average temperature in Stanislaus County at the beginning of September is 34.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 32.3 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Stanislaus County experiences minimal rainfall in September.

    • More

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Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
33°/14°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
49 %
Avg humidity

Stanislaus County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
34°
2
Sunny
33°
3
Sunny
34°
4
Sunny
35°
5
Sunny
36°
6
Sunny
36°
7
Sunny
36°
8
Sunny
35°
9
Overcast
36°
10
Overcast
35°
11
Sunny
33°
12
Cloudy
33°
13
Sunny
32°
14
Sunny
34°
15
Sunny
34°
16
Sunny
31°
17
Overcast
31°
18
Cloudy
28°
19
Mist
31°
20
Sunny
32°
21
Cloudy
31°
22
Sunny
32°
23
Sunny
35°
24
Sunny
38°
25
Sunny
33°
26
Overcast
32°
27
Sunny
28°
28
Sunny
30°
29
Sunny
32°
30
Sunny
33°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 34° /14° 0 mm 9
Sept. 2 Sunny
Sunny
 33° /14° 0 mm 8
Sept. 3 Sunny
Sunny
 34° /15° 0.1 mm 8
Sept. 4 Sunny
Sunny
 35° /15° 0 mm 9
Sept. 5 Sunny
Sunny
 36° /14° 0 mm 9
Sept. 6 Sunny
Sunny
 36° /15° 0 mm 9
Sept. 7 Sunny
Sunny
 36° /15° 0 mm 9
Sept. 8 Sunny
Sunny
 35° /15° 0 mm 8
Sept. 9 Overcast
Overcast
 36° /17° 0 mm 7
Sept. 10 Overcast
Overcast
 35° /16° 0 mm 8
Sept. 11 Sunny
Sunny
 33° /14° 0 mm 8
Sept. 12 Cloudy
Cloudy
 33° /13° 0 mm 8
Sept. 13 Sunny
Sunny
 32° /13° 0 mm 8
Sept. 14 Sunny
Sunny
 34° /14° 0 mm 8
Sept. 15 Sunny
Sunny
 34° /14° 0 mm 8
Sept. 16 Sunny
Sunny
 31° /14° 0 mm 8
Sept. 17 Overcast
Overcast
 31° /12° 0 mm 7
Sept. 18 Cloudy
Cloudy
 28° /13° 0 mm 6
Sept. 19 Mist
Mist
 31° /13° 0 mm 7
Sept. 20 Sunny
Sunny
 32° /14° 0 mm 6
Sept. 21 Cloudy
Cloudy
 31° /13° 0 mm 6.4
Sept. 22 Sunny
Sunny
 32° /13° 0 mm 6.5
Sept. 23 Sunny
Sunny
 35° /15° 0 mm 6.5
Sept. 24 Sunny
Sunny
 38° /19° 0 mm 6.3
Sept. 25 Sunny
Sunny
 33° /16° 0 mm 6.2
Sept. 26 Overcast
Overcast
 32° /16° 0 mm 7
Sept. 27 Sunny
Sunny
 28° /14° 0 mm 7
Sept. 28 Sunny
Sunny
 30° /14° 0 mm 8
Sept. 29 Sunny
Sunny
 32° /14° 0 mm 8
Sept. 30 Sunny
Sunny
 33° /15° 0 mm 8
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 2 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.

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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Location coordinates Where is Stanislaus County?

Get accurate weather forecasts for Stanislaus County, located at latitude 37.639 and longitude -120.997. Stay updated with localized weather information tailored for Stanislaus County.

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