Click on a day for an hourly weather forecast
The temperatures in Watsonville in September are comfortable with low of 14°C and and high up to 25°C.
The wather in Watsonville in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Watsonville in September 2025.
If you’re planning to visit Watsonville in the near future, we highly recommend that you review the 14 day weather forecast for Watsonville before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 7° | 5 | 26 | 0 | 113 mm | Good | Watsonville in January |
| February | 16° / 7° | 5 | 23 | 0 | 88 mm | Good | Watsonville in February |
| March | 16° / 7° | 6 | 25 | 0 | 102 mm | Good | Watsonville in March |
| April | 18° / 8° | 3 | 27 | 0 | 32 mm | Good | Watsonville in April |
| May | 19° / 9° | 2 | 29 | 0 | 12 mm | Good | Watsonville in May |
| June | 22° / 12° | 0 | 30 | 0 | 3 mm | Good | Watsonville in June |
| July | 24° / 13° | 0 | 31 | 0 | 1 mm | Perfect | Watsonville in July |
| August | 24° / 14° | 0 | 31 | 0 | 0 mm | Perfect | Watsonville in August |
| September | 25° / 14° | 1 | 30 | 0 | 3 mm | Perfect | Watsonville in September |
| October | 22° / 12° | 1 | 30 | 0 | 30 mm | Good | Watsonville in October |
| November | 18° / 9° | 4 | 27 | 0 | 50 mm | Good | Watsonville in November |
| December | 15° / 7° | 6 | 25 | 0 | 107 mm | Good | Watsonville in December |