Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 6° | 5 | 26 | 0 | 106 mm | Good | Livermore in January |
| February | 16° / 6° | 4 | 24 | 0 | 95 mm | Good | Livermore in February |
| March | 17° / 7° | 6 | 25 | 0 | 99 mm | Good | Livermore in March |
| April | 20° / 8° | 3 | 27 | 0 | 42 mm | Good | Livermore in April |
| May | 24° / 10° | 1 | 30 | 0 | 19 mm | Perfect | Livermore in May |
| June | 28° / 13° | 1 | 29 | 0 | 8 mm | Perfect | Livermore in June |
| July | 31° / 14° | 0 | 31 | 0 | 4 mm | Good | Livermore in July |
| August | 31° / 15° | 0 | 31 | 0 | 3 mm | Good | Livermore in August |
| September | 30° / 15° | 0 | 30 | 0 | 7 mm | Good | Livermore in September |
| October | 25° / 13° | 2 | 29 | 0 | 38 mm | Perfect | Livermore in October |
| November | 19° / 9° | 3 | 27 | 0 | 59 mm | Good | Livermore in November |
| December | 14° / 6° | 5 | 26 | 0 | 86 mm | Good | Livermore in December |