San Mateo weather by month
Average highs run from 58°F in January to 73°F in July, and January nights average 44°F. It gets 20 inches of rain and melted snow a year, with almost no snow. The most comfortable months are March to November.
Best time to visit San Mateo
For comfortable weather, go in March to November. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 45°F | 3.9 in | 0.0 in | 7 | 0 | 0 | cool |
| February | 61°F | 46°F | 4.0 in | 0.0 in | 8 | 0 | 0 | cool |
| March | 63°F | 48°F | 2.7 in | 0.0 in | 6 | 0 | 0 | mild |
| April | 66°F | 49°F | 1.4 in | 0.0 in | 3 | 0 | 0 | mild |
| May | 68°F | 52°F | 0.5 in | 0.0 in | 2 | 0 | 0 | mild |
| June | 72°F | 54°F | 0.1 in | 0.0 in | 1 | 1 | 0 | mild |
| July | 73°F | 55°F | 0.0 in | 0.0 in | 0 | 0 | 0 | mild |
| August | 73°F | 56°F | 0.0 in | 0.0 in | 0 | 1 | 0 | mild |
| September | 75°F | 56°F | 0.1 in | 0.0 in | 0 | 2 | 0 | mild |
| October | 72°F | 53°F | 0.8 in | 0.0 in | 2 | 1 | 0 | mild |
| November | 64°F | 49°F | 2.0 in | 0.0 in | 4 | 0 | 0 | mild |
| December | 58°F | 45°F | 4.1 in | 0.0 in | 7 | 0 | 0 | cool |
| Year | 67°F avg | 51°F avg | 19.6 in | 0.0 in | 39 | 4 | 0 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station San Francisco Intl. Airport, CA (USW00023234), 5.3 miles from the city center; snowfall from Redwood City, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in San Mateo
The shortest day is December 21, with 9h 34m of daylight; the longest is June 21, with 14h 45m. The earliest sunset comes around December 1 (4:50 pm) and the latest around June 23 (8:34 pm). The sun sets after 8 pm on 106 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:23 am | 5:14 pm | 9h 52m |
| February | 6:58 am | 5:48 pm | 10h 50m |
| March | 7:20 am | 7:16 pm | 11h 56m |
| April | 6:34 am | 7:44 pm | 13h 10m |
| May | 6:00 am | 8:11 pm | 14h 12m |
| June | 5:47 am | 8:32 pm | 14h 44m |
| July | 6:00 am | 8:29 pm | 14h 29m |
| August | 6:25 am | 8:01 pm | 13h 36m |
| September | 6:51 am | 7:16 pm | 12h 25m |
| October | 7:17 am | 6:31 pm | 11h 14m |
| November | 6:49 am | 4:57 pm | 10h 09m |
| December | 7:17 am | 4:51 pm | 9h 35m |
Calculated for 2026 at the center of San Mateo with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is San Mateo getting warmer?
The last 10 years averaged 2.4°F warmer than the 20th century. See the climate stripes for San Mateo.Frequently asked questions
What is the warmest month in San Mateo?
September is the warmest month, with an average high of 75°F and an average low of 56°F (NOAA 1991-2020 normals).
What is the coldest month in San Mateo?
January is the coldest, with average lows of 45°F and highs of 58°F.
What is the rainiest month in San Mateo?
December gets the most precipitation, 4.1 inches on average. July is the driest at 0.0 inches.
Does it snow in San Mateo?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit San Mateo?
For comfortable weather, March to November. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to San Mateo?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full San Mateo profile.
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