San Ramon, CA Weather & Growing Conditions
Overnight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. Southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Partly Cloudy | 2 mph SW | 0% |
| Saturday | 84°F | Patchy Fog then Sunny | 2 to 7 mph SW | 0% |
| Saturday Night | 55°F | Partly Cloudy | 5 mph WSW | 0% |
| Sunday | 75°F | Mostly Cloudy | 2 to 7 mph WSW | 3% |
| Sunday Night | 55°F | Mostly Cloudy | 2 to 6 mph WSW | 3% |
| Monday | 78°F | Mostly Sunny | 3 to 8 mph WSW | 0% |
| Monday Night | 54°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Tuesday | 81°F | Patchy Fog then Sunny | 2 to 7 mph WSW | 0% |
| Tuesday Night | 55°F | Mostly Clear | 0 to 7 mph W | 0% |
| Wednesday | 91°F | Sunny | 0 to 5 mph NW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Thursday | 92°F | Sunny | 0 to 7 mph NW | 0% |
| Thursday Night | 59°F | Mostly Clear | 1 to 7 mph WSW | 0% |
| Friday | 84°F | Mostly Sunny | 1 to 8 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Ramon, CA
Last spring frost
Feb 15
First fall frost
Dec 2
Growing season
292 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, Livermore, Ca (7.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.