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Santa Clara County (San Jose)
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United States weather

Weather in Santa Clara County, California for September 2026

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

    Temperatures

  • Until now, September 2026 in Santa Clara County has been nearly identical to the historical average, with a temperature of 27.5 °F (showing only a slight deviation of 0.2 °F).

  • The forecast for the upcoming days in Santa Clara County predicts a temperature of 29.7 °F, which is slightly above the historical average.

  • In general, the average temperature in Santa Clara County at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 28.1 °F by the end of September.

    • Rain 🌧️

  • Precipitation in Santa Clara County during September is a rare event, with an average of fewer than 2 rainy days.

    • More

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

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/14°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
63 %
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
26°
2
Sunny
27°
3
Overcast
29°
4
Sunny
29°
5
Sunny
28°
6
Sunny
29°
7
Sunny
29°
8
Overcast
29°
9
Overcast
30°
10
Overcast
29°
11
Overcast
26°
12
Overcast
27°
13
Mist
26°
14
Cloudy
29°
15
Overcast
29°
16
Sunny
27°
17
Overcast
25°
18
Mist
24°
19
Mist
27°
20
Overcast
25°
21
Sunny
28°
22
Sunny
29°
23
Sunny
31°
24
Sunny
33°
25
Sunny
28°
26
Overcast
29°
27
Sunny
24°
28
Sunny
26°
29
Sunny
27°
30
Sunny
30°

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
 26° /14° 0.1 mm 6
Sept. 2 Sunny
Sunny
 27° /13° 0 mm 7
Sept. 3 Overcast
Overcast
 29° /14° 0 mm 7
Sept. 4 Sunny
Sunny
 29° /14° 0 mm 8
Sept. 5 Sunny
Sunny
 28° /13° 0 mm 7
Sept. 6 Sunny
Sunny
 29° /14° 0 mm 8
Sept. 7 Sunny
Sunny
 29° /14° 0 mm 7
Sept. 8 Overcast
Overcast
 29° /14° 0 mm 6
Sept. 9 Overcast
Overcast
 30° /15° 0 mm 6
Sept. 10 Overcast
Overcast
 29° /15° 0 mm 7
Sept. 11 Overcast
Overcast
 26° /14° 0 mm 7
Sept. 12 Overcast
Overcast
 27° /13° 0 mm 7
Sept. 13 Mist
Mist
 26° /13° 0 mm 7
Sept. 14 Cloudy
Cloudy
 29° /13° 0 mm 7
Sept. 15 Overcast
Overcast
 29° /14° 0 mm 7
Sept. 16 Sunny
Sunny
 27° /14° 0.3 mm 6
Sept. 17 Overcast
Overcast
 25° /13° 0 mm 6
Sept. 18 Mist
Mist
 24° /14° 3.5 mm 6
Sept. 19 Mist
Mist
 27° /13° 0 mm 6
Sept. 20 Overcast
Overcast
 25° /13° 0 mm 5
Sept. 21 Sunny
Sunny
 28° /10° 0 mm 6.7
Sept. 22 Sunny
Sunny
 29° /11° 0 mm 6.7
Sept. 23 Sunny
Sunny
 31° /13° 0 mm 6.9
Sept. 24 Sunny
Sunny
 33° /16° 0 mm 6.6
Sept. 25 Sunny
Sunny
 28° /14° 0 mm 6.5
Sept. 26 Overcast
Overcast
 29° /13° 0 mm 6
Sept. 27 Sunny
Sunny
 24° /11° 0 mm 6
Sept. 28 Sunny
Sunny
 26° /12° 0 mm 7
Sept. 29 Sunny
Sunny
 27° /13° 0 mm 7
Sept. 30 Sunny
Sunny
 30° /13° 0 mm 7
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 27° 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 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 Santa Clara County during September?
The average wind speed in Santa Clara County during September is 12 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 💧
Typically, Santa Clara County has 1 rainy days in September with a total of 5.8 mm of rainfall.

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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