San Bruno, CA Weather & Climate Normals
What a normal year in San Bruno actually looks like
On the 30-year record NOAA keeps for San Bruno, CA, the comfort score comes out to 76/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 8 months a year land in the 55–75°F range this site treats as mild.
How much San Bruno's weather actually swings
Average temperatures in San Bruno run from 52°F in Jan up to 63°F in Sep, an 11.2°F seasonal swing, one of the smaller gaps in this dataset.
San Bruno, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 58°F | 45°F | 6.14in | 0in |
| Feb | 60°F | 46°F | 6.48in | 0in |
| Mar | 61°F | 46°F | 4.45in | 0in |
| Apr | 64°F | 48°F | 2.36in | 0in |
| May | 67°F | 49°F | 1in | 0in |
| Jun | 69°F | 51°F | 0.25in | 0in |
| Jul | 69°F | 52°F | 0.01in | 0in |
| Aug | 71°F | 53°F | 0.08in | 0in |
| Sep | 72°F | 53°F | 0.11in | 0in |
| Oct | 70°F | 52°F | 1.5in | 0in |
| Nov | 64°F | 50°F | 2.86in | 0in |
| Dec | 59°F | 46°F | 6.64in | 0in |
If you're timing a visit, most of the year (8 of 12 months) are San Bruno's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet San Bruno actually gets
Over a typical year, San Bruno sees about 31.88in of precipitation a year across roughly 69 days with measurable rain or snow, with 0in of snow a year.
San Bruno against the rest of the country
Out of 4876 cities scored here, San Bruno comes in at 198; within CA alone it ranks 198 of 429. Population is about 42,035.
Checking the actual forecast
These figures come from Pacifica 4 Sse, CA US, the NOAA station 3.2 miles from San Bruno, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated