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Weather in Santa Clara County for September 2025

Your guide to Santa Clara County weather in September - trends and predictions
  • In general, the average temperature in Santa Clara County at the beginning of September is 29.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.1 °F by the end of September.

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

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Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/13°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
65 %
Avg humidity

Santa Clara County in September average weather

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Temperatures trend during September in Santa Clara County

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Overcast
Overcast
25° /14° 0 mm 6
Sept. 2 Cloudy
Cloudy
27° /12° 0 mm 7
Sept. 3 Overcast
Overcast
29° /13° 0 mm 7
Sept. 4 Mist
Mist
31° /15° 0 mm 7
Sept. 5 Cloudy
Cloudy
32° /14° 0 mm 8
Sept. 6 Sunny
Sunny
32° /15° 0 mm 8
Sept. 7 Partly cloudy
Partly cloudy
31° /14° 0 mm 8
Sept. 8 Partly cloudy
Partly cloudy
31° /14° 0 mm 8
Sept. 9 Partly cloudy
Partly cloudy
31° /13° 0 mm 8
Sept. 10 Cloudy
Cloudy
29° /12° 0 mm 7
Sept. 11 Cloudy
Cloudy
28° /12° 0 mm 7
Sept. 12 Overcast
Overcast
28° /12° 0 mm 7
Sept. 13 Mist
Mist
30° /13° 0 mm 8
Sept. 14 Cloudy
Cloudy
30° /13° 0 mm 7
Sept. 15 Cloudy
Cloudy
26° /13° 0 mm 6
Sept. 16 Overcast
Overcast
24° /13° 0.6 mm 5
Sept. 17 Overcast
Overcast
21° /12° 0 mm 5
Sept. 18 Mist
Mist
23° /13° 1.5 mm 5
Sept. 19 Mist
Mist
25° /13° 0 mm 6
Sept. 20 Overcast
Overcast
25° /13° 0 mm 6
Sept. 21 Partly cloudy
Partly cloudy
27° /12° 0 mm 7
Sept. 22 Mist
Mist
29° /13° 0 mm 7
Sept. 23 Overcast
Overcast
29° /14° 0 mm 7
Sept. 24 Overcast
Overcast
30° /15° 0 mm 7
Sept. 25 Mist
Mist
27° /13° 0 mm 7
Sept. 26 Overcast
Overcast
27° /13° 0 mm 7
Sept. 27 Mist
Mist
30° /13° 0 mm 7
Sept. 28 Cloudy
Cloudy
28° /14° 0 mm 7
Sept. 29 Overcast
Overcast
28° /13° 0 mm 7
Sept. 30 Light rain shower
Light rain shower
27° /14° 1 mm 6
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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.

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 13°. 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.
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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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