Sunnyvale, CA
Climate overview — based on NOAA 1991-2020 normals from MOFFETT FEDERAL AIRFIELD, CA US.
Year-round temperatures (°F)
Climate summary
Sunnyvale has an annual average temperature of 59.9°F with about 13.5 inches of precipitation per year. The warmest month is September (average high 77.7°F), and the coldest is December (average low 42.1°F). February is typically the wettest month (2.90 in) and July the driest (0.00 in).
Best time to visit Sunnyvale
Full guide →Climate change signal
All-time records →42 of 366 (11.5%) of Sunnyvale'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.
| 1940s | 9 | |
| 1950s | 36 | |
| 1960s | 29 | |
| 1970s | 45 | |
| 1980s | 73 | |
| 1990s | 39 | |
| 2000s | 65 | |
| 2010s | 59 | |
| 2020s | 11 |
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 | 59.0°F | 42.4°F | 50.7°F | 2.49 in | — | 11 |
| February | 61.8°F | 44.5°F | 53.1°F | 2.90 in | — | 11 |
| March | 65.0°F | 46.7°F | 55.8°F | 2.04 in | — | 10 |
| April | 68.0°F | 48.9°F | 58.4°F | 0.98 in | — | 6 |
| May | 71.7°F | 52.5°F | 62.1°F | 0.43 in | — | 3 |
| June | 75.9°F | 55.7°F | 65.8°F | 0.10 in | — | 1 |
| July | 76.9°F | 58.5°F | 67.7°F | 0.00 in | — | 0 |
| August | 76.9°F | 59.0°F | 68.0°F | 0.01 in | — | 0 |
| September | 77.7°F | 57.3°F | 67.5°F | 0.07 in | — | 1 |
| October | 74.1°F | 53.1°F | 63.6°F | 0.56 in | — | 4 |
| November | 65.5°F | 46.3°F | 55.9°F | 1.36 in | — | 9 |
| December | 58.9°F | 42.1°F | 50.5°F | 2.51 in | — | 11 |
Climate twins of Sunnyvale
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).