San Ramon, CA Weather & Growing Conditions
Tonight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy | 7 mph SW | 0% |
| Saturday | 85°F | Sunny | 3 to 8 mph SW | 0% |
| Saturday Night | 56°F | Mostly Cloudy | 8 mph SW | 0% |
| Sunday | 76°F | Partly Sunny | 6 to 9 mph SW | 4% |
| Sunday Night | 55°F | Mostly Cloudy | 6 to 9 mph SW | 4% |
| Monday | 78°F | Mostly Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 55°F | Mostly Clear | 5 to 9 mph SW | 0% |
| Tuesday | 83°F | Sunny | 3 to 8 mph WSW | 0% |
| Tuesday Night | 56°F | Mostly Clear | 1 to 8 mph SW | 0% |
| Wednesday | 94°F | Sunny | 1 to 7 mph WSW | 0% |
| Wednesday Night | 61°F | Mostly Clear | 1 to 7 mph WSW | 0% |
| Thursday | 94°F | Sunny | 1 to 8 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Friday | 86°F | Sunny | 3 to 9 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Ramon, CA
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
Explore more for San Ramon, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (8.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.