San Ramon, CA Weather & Growing Conditions
Today
96°F
Sunny
Sunny. High near 96, with temperatures falling to around 92 in the afternoon. West southwest wind 3 to 9 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 96°F | Sunny | 3 to 9 mph WSW | 0% |
| Tonight | 58°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Wednesday | 93°F | Sunny | 3 to 9 mph WSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Thursday | 90°F | Sunny | 3 to 9 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Friday | 94°F | Sunny | 3 to 9 mph WSW | 0% |
| Friday Night | 62°F | Mostly Clear | 5 to 9 mph WSW | 0% |
| Saturday | 94°F | Sunny | 3 to 9 mph WSW | 0% |
| Saturday Night | 62°F | Mostly Clear | 6 to 9 mph SW | 0% |
| Sunday | 87°F | Sunny | 6 to 10 mph SW | 0% |
| Sunday Night | 58°F | Mostly Clear | 12 mph SW | 0% |
| Monday | 82°F | Sunny | 8 to 12 mph SW | 0% |
| Monday Night | 57°F | Mostly Clear | 7 to 12 mph WSW | 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 Aug 4, 2026.