Atherton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Atherton, a town in San Mateo County, California.
Today
90°F
Haze then Sunny
Haze between 7am and 8am. Sunny, with a high near 90. North wind 1 to 8 mph.
7-day forecast for Atherton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Haze then Sunny | 1 to 8 mph N | 0% |
| Tonight | 59°F | Mostly Clear | 1 to 6 mph E | 0% |
| Wednesday | 89°F | Sunny | 1 to 8 mph WNW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 0 to 7 mph W | 0% |
| Thursday | 87°F | Sunny | 0 to 8 mph WNW | 0% |
| Thursday Night | 61°F | Mostly Clear | 1 to 8 mph WNW | 0% |
| Friday | 91°F | Sunny | 1 to 8 mph WNW | 0% |
| Friday Night | 62°F | Mostly Clear | 0 to 8 mph W | 0% |
| Saturday | 91°F | Sunny | 1 to 8 mph WNW | 0% |
| Saturday Night | 62°F | Mostly Clear | 2 to 8 mph W | 0% |
| Sunday | 86°F | Sunny | 2 to 9 mph W | 0% |
| Sunday Night | 60°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Monday | 83°F | Sunny | 3 to 9 mph WSW | 0% |
| Monday Night | 58°F | Mostly Clear | 3 to 9 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Atherton (37.457, -122.201). Updated through the day.
Growing snapshot for Atherton
Last spring frost
Jan 17
First fall frost
Dec 12
Growing season
333 days
Hardiness zone
9b
More local growing data for Atherton: nearby ZIP 94027 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Baywood Park
Belmont
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 (2.5 mi from Atherton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.