San Ramon, CA Weather & Climate Normals
San Ramon's real weather, in one number
San Ramon, CA scores 62/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 6 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
San Ramon's hottest and coldest months
San Ramon's hottest month is Jul, averaging 72°F; its coldest is Dec, averaging 47°F, a 24.7°F swing across the year, a middling gap by national standards.
Rain and snow in San Ramon
San Ramon averages 26.05in of precipitation a year across roughly 68 days with measurable rain or snow, and 0.7in of snow a year.
Where San Ramon ranks
San Ramon ranks 392 of 4876 US cities in this dataset for comfort score, and 287 of 429 within CA. About 85,924 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from MT DIABLO JUNCTION, CA US, 7.9 miles from San Ramon, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station