The temperatures in San Jose in September are comfortable with low of 17°C and and high up to 22°C.
With more than 22 rainy days, San Jose is an incredibly wet during September. Be sure to pack your umbrella and bring along your rubber boots to stay dry. It’s going to be raining cats and dogs this month!
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
22° / 17°
Rainy Days
28
Snowy Days
0
Dry Days
2
Rainfall
793
mm
Sun Hours
10.5
Hrs
