Click on a day for an hourly weather forecast
The temperatures in Napa in May are comfortable with low of 11°C and and high up to 23°C.
The wather in Napa in May 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 Napa in May 2025.
If you’re planning to visit Napa in the near future, we highly recommend that you review the 14 day weather forecast for Napa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 7° | 5 | 26 | 0 | 121 mm | Good | Napa in January |
| February | 16° / 7° | 4 | 24 | 0 | 111 mm | Good | Napa in February |
| March | 17° / 8° | 6 | 25 | 0 | 103 mm | Good | Napa in March |
| April | 20° / 9° | 3 | 28 | 0 | 41 mm | Good | Napa in April |
| May | 23° / 11° | 2 | 29 | 0 | 25 mm | Perfect | Napa in May |
| June | 27° / 13° | 1 | 29 | 0 | 7 mm | Perfect | Napa in June |
| July | 29° / 14° | 0 | 31 | 0 | 2 mm | Good | Napa in July |
| August | 29° / 15° | 0 | 31 | 0 | 2 mm | Good | Napa in August |
| September | 29° / 15° | 0 | 30 | 0 | 3 mm | Good | Napa in September |
| October | 24° / 14° | 2 | 29 | 0 | 47 mm | Perfect | Napa in October |
| November | 18° / 10° | 3 | 27 | 0 | 65 mm | Good | Napa in November |
| December | 14° / 7° | 5 | 26 | 0 | 96 mm | Good | Napa in December |