Foster City, CA Weather & Growing Conditions
Today
84°F
Sunny
Sunny. High near 84, with temperatures falling to around 82 in the afternoon. Northwest wind 2 to 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 2 to 12 mph NW | 0% |
| Tonight | 58°F | Mostly Clear | 2 to 10 mph W | 0% |
| Wednesday | 83°F | Sunny | 2 to 10 mph WNW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 1 to 10 mph W | 0% |
| Thursday | 82°F | Sunny | 1 to 12 mph W | 0% |
| Thursday Night | 60°F | Mostly Clear | 2 to 12 mph WNW | 0% |
| Friday | 85°F | Sunny | 2 to 10 mph WNW | 0% |
| Friday Night | 61°F | Mostly Clear | 1 to 10 mph W | 0% |
| Saturday | 85°F | Sunny | 1 to 10 mph W | 0% |
| Saturday Night | 62°F | Mostly Clear | 2 to 10 mph W | 0% |
| Sunday | 81°F | Sunny | 2 to 12 mph WSW | 0% |
| Sunday Night | 59°F | Mostly Clear | 5 to 12 mph WSW | 0% |
| Monday | 78°F | Sunny | 5 to 13 mph WSW | 0% |
| Monday Night | 58°F | Mostly Clear | 5 to 13 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Foster City, CA
Last spring frost
Jan 17
First fall frost
Dec 12
Growing season
333 days
Hardiness zone
10a
Explore more for Foster City, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Redwood City, Ca (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.