Is San Jose hot in September?
Days are typically warm at 27.1°C, while nights average 14.1°C.
United States · 1991–2020 normal
San Jose in
September.
Typical September weather in San Jose: 27.1°C by day, 14.1°C at night, 2 mm of rain over 0.3 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high27.1°C
Typical low14.1°C
Rain2 mm
Wet days0.3
In the year-round weather comparison, September scores 88 out of 100 (October leads the year at 93). Daylight is calculated as 12 h 23 from latitude 37.34°. Open-water sea temperature is 14.9°C (43 km from the place centre).
September at a glance
What is San Jose like in September?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 2 mm across about 0 wet days.
How much daylight is there?
There are about 12 h 23 between sunrise and sunset at mid-month, calculated from the place latitude.
Is September a good time to visit?
September ranks 6 of 12 in our weather comparison; October ranks first.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5392171
- NOAA station
- USW00023293 · SAN JOSE
- Station distance
- 3.4 km from the place centre
- Coverage
- Good coverage · 23 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for San Jose is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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