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Santa Clara County (San Jose)
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United States weather

Weather in Santa Clara County, California for September 2025

Your guide to Santa Clara County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Santa Clara County is cooler than usual, with temperatures averaging 23.8 °F, this is -4.2 °F below the typical seasonal average.

  • The forecast for the upcoming days in Santa Clara County predicts a temperature of 29.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Santa Clara County at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 27.4 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Santa Clara 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
28°/14°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
59 %
Avg humidity

Santa Clara County Weather September

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

Temperatures trend during September in Santa Clara County

See the weather trend as well as the moving average line

September weather in Santa Clara County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 28° /15° 0 mm 7
Sept. 2 Sunny
Sunny
 28° /14° 0 mm 7
Sept. 3 Overcast
Overcast
 30° /14° 0 mm 7
Sept. 4 Mist
Mist
 31° /15° 0 mm 7
Sept. 5 Cloudy
Cloudy
 29° /14° 0 mm 7
Sept. 6 Sunny
Sunny
 30° /14° 0 mm 7
Sept. 7 Partly cloudy
Partly cloudy
 28° /15° 0 mm 7
Sept. 8 Partly cloudy
Partly cloudy
 27° /14° 0 mm 7
Sept. 9 Partly cloudy
Partly cloudy
 27° /14° 0 mm 7
Sept. 10 Cloudy
Cloudy
 26° /13° 0 mm 6
Sept. 11 Cloudy
Cloudy
 25° /13° 0 mm 6
Sept. 12 Overcast
Overcast
 27° /13° 0 mm 6
Sept. 13 Mist
Mist
 27° /13° 0 mm 7
Sept. 14 Cloudy
Cloudy
 29° /14° 0 mm 7
Sept. 15 Sunny
Sunny
 33° /15° 0 mm 1.8
Sept. 16 Sunny
Sunny
 33° /17° 0 mm 1.8
Sept. 17 Sunny
Sunny
 32° /17° 0 mm 1.4
Sept. 18 Patchy rain possible
Patchy rain possible
 27° /19° 0.8 mm 0.7
Sept. 19 Patchy rain possible
Patchy rain possible
 22° /17° 2.9 mm 0
Sept. 20 Overcast
Overcast
 27° /17° 0 mm 5
Sept. 21 Sunny
Sunny
 31° /16° 0 mm 6
Sept. 22 Sunny
Sunny
 33° /16° 0 mm 6
Sept. 23 Sunny
Sunny
 32° /18° 0 mm 6
Sept. 24 Sunny
Sunny
 27° /15° 0 mm 6
Sept. 25 Sunny
Sunny
 26° /14° 0 mm 5
Sept. 26 Sunny
Sunny
 27° /13° 0 mm 5
Sept. 27 Sunny
Sunny
 31° /13° 0 mm 6
Sept. 28 Sunny
Sunny
 26° /14° 0 mm 5
Sept. 29 Overcast
Overcast
 28° /13° 0 mm 7
Sept. 30 Light rain shower
Light rain shower
 27° /14° 1 mm 6
Next
Important Notice
Our weather forecast for Santa Clara 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 Santa Clara County forecast closer to your planned date for the most up-to-date weather information.
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Santa Clara County in September - FAQ

What are the expected maximum and minimum temperatures in Santa Clara County during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Santa Clara County during September?
Rainfall in Santa Clara 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 Santa Clara County during September?
The average wind speed in Santa Clara County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Santa Clara County

Explore the daily rainfall trends and prepare for Santa Clara Countys September weather 💧

UV exposure in Santa Clara 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 Santa Clara County?

Get accurate weather forecasts for Santa Clara County, located at latitude 37.339 and longitude -121.895. Stay updated with localized weather information tailored for Santa Clara County.

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