Sunnyvale, CA Weather & Climate Normals
What a normal year in Sunnyvale actually looks like
On the 30-year record NOAA keeps for Sunnyvale, CA, the comfort score comes out to 78/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 9 months a year land in the 55–75°F range this site treats as mild.
How much Sunnyvale's weather actually swings
Average temperatures in Sunnyvale run from 51°F in Dec up to 68°F in Aug, a 17.5°F seasonal swing, one of the smaller gaps in this dataset.
Sunnyvale, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 59°F | 42°F | 2.49in |
| Feb | 62°F | 45°F | 2.9in |
| Mar | 65°F | 47°F | 2.04in |
| Apr | 68°F | 49°F | 0.98in |
| May | 72°F | 53°F | 0.43in |
| Jun | 76°F | 56°F | 0.1in |
| Jul | 77°F | 59°F | 0in |
| Aug | 77°F | 59°F | 0.01in |
| Sep | 78°F | 57°F | 0.07in |
| Oct | 74°F | 53°F | 0.56in |
| Nov | 66°F | 46°F | 1.36in |
| Dec | 59°F | 42°F | 2.51in |
If you're timing a visit, most of the year (9 of 12 months) are Sunnyvale's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Sunnyvale actually gets
Sunnyvale averages 13.45in of precipitation a year across roughly 66 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Sunnyvale against the rest of the country
Out of 4876 cities scored here, Sunnyvale comes in at 143; within CA alone it ranks 143 of 429. Population is about 156,792.
Checking the actual forecast
These figures come from Moffett Federal Airfield, CA US, the NOAA station 1.8 miles from Sunnyvale, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is