San Bruno, CA
Climate overview — based on NOAA 1991-2020 normals from PACIFICA 4 SSE, CA US.
Year-round temperatures (°F)
Climate summary
San Bruno has an annual average temperature of 57.4°F with about 31.9 inches of precipitation per year. The warmest month is September (average high 72.3°F), and the coldest is January (average low 45.3°F). December is typically the wettest month (6.64 in) and July the driest (0.01 in).
Best time to visit San Bruno
Full guide →Climate change signal
All-time records →0 of 366 (0%) of San Bruno's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1980s | 109 | |
| 1990s | 108 | |
| 2000s | 132 | |
| 2010s | 17 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 58.1°F | 45.3°F | 51.7°F | 6.14 in | — | 11 |
| February | 60.1°F | 46.0°F | 53.1°F | 6.48 in | — | 12 |
| March | 61.4°F | 46.1°F | 53.8°F | 4.45 in | — | 10 |
| April | 63.9°F | 47.6°F | 55.7°F | 2.36 in | — | 6 |
| May | 66.9°F | 49.4°F | 58.2°F | 1.00 in | — | 4 |
| June | 68.8°F | 50.8°F | 59.8°F | 0.25 in | — | 2 |
| July | 69.4°F | 52.3°F | 60.8°F | 0.01 in | — | 0 |
| August | 71.0°F | 53.3°F | 62.2°F | 0.08 in | — | 1 |
| September | 72.3°F | 53.4°F | 62.9°F | 0.11 in | — | 2 |
| October | 70.1°F | 52.3°F | 61.2°F | 1.50 in | — | 4 |
| November | 64.1°F | 49.7°F | 56.9°F | 2.86 in | — | 7 |
| December | 58.8°F | 46.2°F | 52.5°F | 6.64 in | — | 11 |
Climate twins of San Bruno
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).