Click on a day for an hourly weather forecast
The temperatures in San Mateo in May are usually low and can range between 11°C and 18°C.
The wather in San Mateo 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 San Mateo in May 2025.
If you’re planning to visit San Mateo in the near future, we highly recommend that you review the 14 day weather forecast for San Mateo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 9° | 6 | 25 | 0 | 92 mm | Good | San Mateo in January |
| February | 15° / 9° | 5 | 23 | 0 | 82 mm | Good | San Mateo in February |
| March | 16° / 9° | 7 | 24 | 0 | 85 mm | Ok | San Mateo in March |
| April | 17° / 10° | 3 | 27 | 0 | 35 mm | Good | San Mateo in April |
| May | 18° / 11° | 2 | 29 | 0 | 15 mm | Good | San Mateo in May |
| June | 21° / 13° | 1 | 29 | 0 | 4 mm | Good | San Mateo in June |
| July | 22° / 14° | 0 | 31 | 0 | 1 mm | Good | San Mateo in July |
| August | 23° / 15° | 0 | 31 | 0 | 0 mm | Perfect | San Mateo in August |
| September | 23° / 15° | 0 | 30 | 0 | 3 mm | Perfect | San Mateo in September |
| October | 21° / 14° | 2 | 29 | 0 | 28 mm | Good | San Mateo in October |
| November | 17° / 11° | 4 | 26 | 0 | 51 mm | Good | San Mateo in November |
| December | 14° / 9° | 6 | 25 | 0 | 101 mm | Good | San Mateo in December |