Click on a day for an hourly weather forecast
The temperatures in Santa Rosa in May are quite cold with temperatures between 9°C and 23°C, warm clothes are a must.
The wather in Santa Rosa 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 Santa Rosa in May 2025.
If you’re planning to visit Santa Rosa in the near future, we highly recommend that you review the 14 day weather forecast for Santa Rosa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 14° / 5° | 5 | 26 | 0 | 152 mm | Good | Santa Rosa in January |
| February | 15° / 5° | 5 | 23 | 0 | 155 mm | Good | Santa Rosa in February |
| March | 17° / 6° | 7 | 24 | 0 | 133 mm | Ok | Santa Rosa in March |
| April | 20° / 7° | 3 | 27 | 0 | 44 mm | Good | Santa Rosa in April |
| May | 23° / 9° | 2 | 29 | 0 | 27 mm | Perfect | Santa Rosa in May |
| June | 27° / 12° | 1 | 29 | 0 | 9 mm | Perfect | Santa Rosa in June |
| July | 29° / 12° | 0 | 31 | 0 | 2 mm | Good | Santa Rosa in July |
| August | 29° / 13° | 0 | 31 | 0 | 2 mm | Good | Santa Rosa in August |
| September | 29° / 13° | 0 | 30 | 0 | 4 mm | Good | Santa Rosa in September |
| October | 24° / 11° | 3 | 28 | 0 | 55 mm | Perfect | Santa Rosa in October |
| November | 18° / 8° | 3 | 27 | 0 | 72 mm | Good | Santa Rosa in November |
| December | 13° / 5° | 6 | 25 | 0 | 119 mm | Ok | Santa Rosa in December |