San Jose (CA)
September
Weather in San Jose, California for September 2026
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 29.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 26.6 °C by the end of September.
Precipitation in San Jose during September is a rare event, with an average of fewer than 2 rainy days.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
29
Dry days
1
Rainy days
0
Snow days
27°/14°
Temperatures
12 km/h
Avg max wind
63 %
Avg humidity
San Jose Weather September
Move between months or click on a day
Temperatures trend during September in San Jose
See the weather trend as well as the moving average line
September weather in San Jose day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /15° | 0 mm | 7 | |
| Sept. 2 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 3 |  Overcast | 30° /14° | 0 mm | 7 | |
| Sept. 4 |  Mist | 31° /15° | 0 mm | 7 | |
| Sept. 5 |  Cloudy | 29° /14° | 0 mm | 7 | |
| Sept. 6 | Sunny | 30° /14° | 0 mm | 7 | |
| Sept. 7 |  Partly cloudy | 28° /15° | 0 mm | 7 | |
| Sept. 8 | Partly cloudy | 27° /14° | 0 mm | 7 | |
| Sept. 9 | Partly cloudy | 27° /14° | 0 mm | 7 | |
| Sept. 10 | Cloudy | 26° /13° | 0 mm | 6 | |
| Sept. 11 | Cloudy | 25° /13° | 0 mm | 6 | |
| Sept. 12 | Overcast | 27° /13° | 0 mm | 6 | |
| Sept. 13 | Mist | 27° /13° | 0 mm | 7 | |
| Sept. 14 | Cloudy | 29° /14° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 29° /14° | 0 mm | 7 | |
| Sept. 16 | Overcast | 28° /15° | 0.4 mm | 6 | |
| Sept. 17 | Overcast | 25° /14° | 0 mm | 6 | |
| Sept. 18 | Mist | 23° /14° | 4.7 mm | 5 | |
| Sept. 19 | Mist | 26° /14° | 0 mm | 6 | |
| Sept. 20 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 26° /12° | 0 mm | 6 | |
| Sept. 22 | Mist | 29° /13° | 0 mm | 7 | |
| Sept. 23 | Sunny | 32° /15° | 0 mm | 7 | |
| Sept. 24 | Overcast | 27° /15° | 0 mm | 6 | |
| Sept. 25 | Mist | 26° /14° | 0 mm | 6 | |
| Sept. 26 | Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 27 | Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 28 | Cloudy | 25° /14° | 0 mm | 6 | |
| Sept. 29 | Overcast | 26° /14° | 0 mm | 6 | |
| Sept. 30 |  Light rain shower | 25° /15° | 0.7 mm | 6 | |
| Next | |||||
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.
Change Month
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 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 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 💧
Typically, San Jose has 1 rainy days in September with a total of 5.8 mm of rainfall.
UV exposure in San Jose during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More San Jose weather pages
You are here
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.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.