San Jose
September
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.
With an average of 2 rainy days, San Jose experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
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28
Dry days
2
Rainy days
0
Snow days
28°/14°
Temperatures
11 km/h
Avg max wind
59 %
Avg humidity
San Jose in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  27° | 3 29° | 4  31° | 5 32° | 6  32° | 7  31° |
| 8 31° | 9 31° | 10 29° | 11 28° | 12 28° | 13 30° | 14 30° |
| 15 26° | 16 24° | 17 21° | 18 23° | 19 25° | 20 25° | 21 27° |
| 22 29° | 23 29° | 24 30° | 25 27° | 26 27° | 27 30° | 28 28° |
| 29 28° | 30  27° |
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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 | 25° /14° | 0 mm | 6 | |
| Sept. 2 | Cloudy | 27° /12° | 0 mm | 7 | |
| Sept. 3 | Overcast | 29° /13° | 0 mm | 7 | |
| Sept. 4 | Mist | 31° /15° | 0 mm | 7 | |
| Sept. 5 | Cloudy | 32° /14° | 0 mm | 8 | |
| Sept. 6 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 7 | Partly cloudy | 31° /14° | 0 mm | 8 | |
| Sept. 8 | Partly cloudy | 31° /14° | 0 mm | 8 | |
| Sept. 9 | Partly cloudy | 31° /13° | 0 mm | 8 | |
| Sept. 10 | Cloudy | 29° /12° | 0 mm | 7 | |
| Sept. 11 | Cloudy | 28° /12° | 0 mm | 7 | |
| Sept. 12 | Overcast | 28° /12° | 0 mm | 7 | |
| Sept. 13 | Mist | 30° /13° | 0 mm | 8 | |
| Sept. 14 | Cloudy | 30° /13° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 26° /13° | 0 mm | 6 | |
| Sept. 16 | Overcast | 24° /13° | 0.6 mm | 5 | |
| Sept. 17 | Overcast | 21° /12° | 0 mm | 5 | |
| Sept. 18 | Mist | 23° /13° | 1.5 mm | 5 | |
| Sept. 19 | Mist | 25° /13° | 0 mm | 6 | |
| Sept. 20 | Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 27° /12° | 0 mm | 7 | |
| Sept. 22 | Mist | 29° /13° | 0 mm | 7 | |
| Sept. 23 | Overcast | 29° /14° | 0 mm | 7 | |
| Sept. 24 | Overcast | 30° /15° | 0 mm | 7 | |
| Sept. 25 | Mist | 27° /13° | 0 mm | 7 | |
| Sept. 26 | Overcast | 27° /13° | 0 mm | 7 | |
| Sept. 27 | Mist | 30° /13° | 0 mm | 7 | |
| Sept. 28 | Cloudy | 28° /14° | 0 mm | 7 | |
| Sept. 29 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 30 | 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 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 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 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 San Jose during September?
The average wind speed in San Jose during September is 11 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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