San Jose Weather: September
 |
Average Day Temperature: | 84.5°F |
|
Average Night Temperature: | 60.2°F |
|
Sea Water Temperature: | 64.9°F |
|
Number of Sunny Days: | 24 days |
| Sunshine Hours: | 11.8 - 13.0 hours | |
|
Number of Rainy Days: | 0 days |
| Precipitation Totals: | 0.1 in | |
| detailed information | ||
forecast
| San Jose |
Temperature
| San Jose |
Air Temperature in September, °F
The highest day temperature in September 2025 was 98°F. The lowest night temperature was 60°F. The average values for day and night temperatures during September were 83.3°F и 64.7°F respectivly.
San Jose Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for San Jose was 71.7°F. The maximum and minimum values were 68.6°F and 75.0°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for San Jose is 0.1 in. It makes september the least rainy month of the year.
The average wind speed in September is 5.0 mph. This value is relatively stable throughout the year.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Jose in September is 10.6 hours.
San Jose on the Weather Map
| Chicago |  |
-2 |
| Hawaii | |
+78 |
| Honolulu | |
+78 |
| Houston | |
+44 |
| Las Vegas |  |
+38 |
| Los Angeles | |
+50 |
| Maui | |
+70 |
| Miami | |
+68 |
| Miami Beach |  |
+80 |
| New York | |
+16 |
| San Diego | |
+52 |
| San Francisco | |
+46 |
| Sarasota | |
+64 |
| Tampa | |
+62 |
| Washington |  |
+26 |
| 0300 |  |
42°F | W 1 mph |
| 0600 |  |
42°F | SW 2 mph |
| 0900 |  |
46°F | SW 1 mph |
| 1200 |  |
64°F | SE 2 mph |
| 1500 | |
68°F | SE 2 mph |
| 1800 | |
60°F | SE 2 mph |
| 2100 | |
54°F | NW 1 mph |
| 0000 | |
52°F | NW 1 mph |