The temperatures in San Jose in September are comfortable with low of 13°C and and high up to 29°C.
There is little to no rain in San Jose during September, so it’s a lot easier to explore the city. Just remember to dress in warm layers, as it can still get pretty chilly.
Our weather forecast can give you a great sense of what weather to expect in San Jose in September 2025.
If you’re planning to visit San Jose in the near future, we highly recommend that you review the 14 day weather forecast for San Jose before you arrive.
Temperatures
29° / 13°
Rainy Days
0
Snowy Days
0
Dry Days
30
Rainfall
7
mm
Sun Hours
11.9
Hrs
