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Weather in San Jose for September 2025

Your guide to San Jose weather in September - trends and predictions
  • In general, the average temperature in San Jose 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 San Jose 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

San Jose in September average weather

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Temperatures trend during September in San Jose

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 San Jose 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 San Jose forecast closer to your planned date for the most up-to-date weather information.

San Jose in September - FAQ

What are the expected maximum and minimum temperatures in San Jose 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 San Jose during September?
Rainfall in San Jose 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 San Jose during September?
The average wind speed in San Jose during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in San Jose

Explore the daily rainfall trends and prepare for San Joses September weather 💧

UV exposure in San Jose during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is San Jose?

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

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