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
65°F
Chance Light Rain
A chance of rain. Partly sunny. High near 65, with temperatures falling to around 60 in the afternoon. South wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Belmont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Chance Light Rain | 5 mph S | 42% |
| Tonight | 51°F | Chance Light Rain then Mostly Cloudy | 3 to 7 mph ESE | 40% |
| Wednesday | 67°F | Sunny | 3 to 15 mph N | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 15 mph NW | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 2 to 8 mph NNW | 0% |
| Thursday Night | 52°F | Mostly Clear | 2 to 8 mph NNW | 0% |
| Friday | 73°F | Sunny | 2 to 7 mph NNE | 0% |
| Friday Night | 52°F | Clear | 1 to 7 mph NNE | 0% |
| Saturday | 77°F | Sunny | 3 mph NNE | 0% |
| Saturday Night | 54°F | Mostly Clear | 1 to 8 mph NW | 0% |
| Sunday | 75°F | Mostly Sunny | 1 to 7 mph NNW | 0% |
| Sunday Night | 54°F | Partly Cloudy | 1 to 7 mph WNW | 0% |
| Monday | 72°F | Partly Sunny | 1 to 9 mph WNW | 1% |
| Monday Night | 53°F | Partly Cloudy | 1 to 9 mph NW | 2% |
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
Nearby towns & communities
Atherton
Baywood Park
Brisbane
Broadmoor
Burlingame
Colma
Daly City
El Granada
Emerald Lake Hills
Foster City
Half Moon Bay
Highlands
Hillsborough
La Honda
Ladera
Loma Mar
Millbrae
Montara
Moss Beach
North Fair Oaks
Pacifica
Pescadero
Portola Valley
Redwood City
San Bruno
San Carlos
San Mateo
South San Francisco
West Menlo Park
Woodside
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 Nov 4, 2026.