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.
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