Climate
San Mateo weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: June, July, August, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 58°F | 45°F | 3.9 in | 11 |
| February | 61°F | 46°F | 4.0 in | 11 |
| March | 63°F | 48°F | 2.7 in | 10 |
| April | 66°F | 49°F | 1.4 in | 6 |
| May | 68°F | 52°F | 0.50 in | 3 |
| June | 72°F | 54°F | 0.10 in | 1 |
| July | 73°F | 55°F | 0.00 in | 0 |
| August | 73°F | 56°F | 0.00 in | 0 |
| September | 75°F | 56°F | 0.10 in | 1 |
| October | 72°F | 53°F | 0.80 in | 3 |
| November | 64°F | 49°F | 2.0 in | 7 |
| December | 58°F | 45°F | 4.1 in | 11 |
NOAA U.S. Climate Normals 1991–2020, San Francisco Intl Ap, Ca Us (5.3 mi away, 8 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in San Mateo?
September, with an average high of 75°F and low of 56°F.
What is the coldest month in San Mateo?
January, with an average low of 45°F and high of 58°F.
When does it rain most in San Mateo?
December is the wettest month, averaging 4.1 in of precipitation; the year totals about 19.6 inches.
What is the best time to visit San Mateo?
For mild weather (highs between 65°F and 85°F) with the least rain, June, July, August.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the San Francisco Intl Ap weather station, 5.3 miles from downtown: 30-year averages, not a forecast.