The weather in Livermore in September is hot. The average temperatures are between 15°C and 30°C. Usually the days in September are hot while the nights are a bit cooler.
You can expect up to 3 rainy days in Livermore during the month of September.
Our weather forecast can give you a great sense of what weather to expect in Livermore in September 2025.
If you’re planning to visit Livermore in the near future, we highly recommend that you review the 14 day weather forecast for Livermore before you arrive.
Temperatures
30° / 15°
Rainy Days
0
Snowy Days
0
Dry Days
30
Rainfall
7
mm
Sun Hours
11.9
Hrs
