San Ramon, CA Weather & Growing Conditions
This Afternoon
61°F
Light Rain Likely
Rain likely. Mostly cloudy. High near 61, with temperatures falling to around 57 in the afternoon. South southwest wind 3 to 8 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Light Rain Likely | 3 to 8 mph SSW | 71% |
| Tonight | 47°F | Chance Light Rain then Mostly Cloudy | 5 mph E | 38% |
| Wednesday | 66°F | Sunny | 3 to 7 mph NNW | 1% |
| Wednesday Night | 47°F | Mostly Cloudy then Patchy Fog | 0 to 6 mph W | 0% |
| Thursday | 70°F | Areas Of Fog then Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 47°F | Mostly Clear | 0 to 5 mph W | 0% |
| Friday | 73°F | Sunny | 0 to 3 mph N | 0% |
| Friday Night | 49°F | Clear | 2 mph NE | 0% |
| Saturday | 75°F | Sunny | 3 mph NE | 0% |
| Saturday Night | 50°F | Mostly Clear | 0 to 3 mph WSW | 0% |
| Sunday | 74°F | Mostly Sunny | 3 mph NNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 to 3 mph SW | 0% |
| Monday | 71°F | Partly Sunny | 1 to 5 mph SW | 1% |
| Monday Night | 50°F | Partly Cloudy | 1 to 5 mph SW | 1% |
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 Nov 3, 2026.