Belmont, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belmont, a city in San Mateo County, California.
This Afternoon
77°F
Sunny
Sunny. High near 77, with temperatures falling to around 74 in the afternoon. West northwest wind 9 to 15 mph, with gusts as high as 22 mph.
7-day forecast for Belmont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Sunny | 9 to 15 mph WNW | 0% |
| Tonight | 58°F | Mostly Clear | 3 to 14 mph WSW | 1% |
| Saturday | 79°F | Sunny | 2 to 14 mph WSW | 0% |
| Saturday Night | 58°F | Mostly Cloudy | 5 to 13 mph W | 1% |
| Sunday | 72°F | Partly Sunny | 5 to 12 mph W | 4% |
| Sunday Night | 58°F | Mostly Cloudy | 3 to 12 mph W | 4% |
| Monday | 75°F | Mostly Sunny | 3 to 10 mph WSW | 0% |
| Monday Night | 58°F | Partly Cloudy | 2 to 10 mph WSW | 0% |
| Tuesday | 78°F | Sunny | 1 to 10 mph WSW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 1 to 10 mph WSW | 0% |
| Wednesday | 87°F | Sunny | 0 to 12 mph W | 0% |
| Wednesday Night | 61°F | Mostly Clear | 1 to 12 mph W | 0% |
| Thursday | 88°F | Sunny | 0 to 12 mph W | 0% |
| Thursday Night | 61°F | Mostly Clear | 2 to 12 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Belmont (37.514, -122.294). Updated through the day.
Growing snapshot for Belmont
Last spring frost
Jan 17
First fall frost
Dec 12
Growing season
333 days
Hardiness zone
10a
More local growing data for Belmont: nearby ZIP 94002 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Redwood City, Ca (4.1 mi from Belmont). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.