San Ramon, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Ramon, a city in Contra Costa County, California.
Today
97°F
Sunny
Sunny. High near 97, with temperatures falling to around 94 in the afternoon. West wind 2 to 8 mph.
7-day forecast for San Ramon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Sunny | 2 to 8 mph W | 0% |
| Tonight | 58°F | Clear | 2 to 7 mph WNW | 0% |
| Wednesday | 93°F | Sunny | 2 to 7 mph W | 0% |
| Wednesday Night | 59°F | Mostly Clear | 2 to 7 mph WSW | 0% |
| Thursday | 91°F | Sunny | 2 to 8 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Friday | 94°F | Sunny | 2 to 8 mph WSW | 0% |
| Friday Night | 62°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Saturday | 95°F | Sunny | 2 to 8 mph WSW | 0% |
| Saturday Night | 63°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Sunday | 88°F | Sunny | 3 to 9 mph WSW | 0% |
| Sunday Night | 58°F | Mostly Clear | 5 to 9 mph WSW | 0% |
| Monday | 83°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 57°F | Mostly Clear | 5 to 10 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for San Ramon (37.765, -121.932). Updated through the day.
Growing snapshot for San Ramon
Last spring frost
Feb 15
First fall frost
Dec 2
Growing season
292 days
Hardiness zone
9b
More local growing data for San Ramon: nearby ZIP 94582 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
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Bethel Island
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Castle Hill
Clayton
Clyde
Concord
Contra Costa Centre
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Danville
Diablo
Discovery Bay
East Richmond Heights
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Mountain View
Climate data from the nearest NOAA station, Livermore, Ca (7.5 mi from San Ramon). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.