Atherton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Atherton, a town in San Mateo County, California.
Tonight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. East northeast wind around 5 mph.
7-day forecast for Atherton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Cloudy | 5 mph ENE | 6% |
| Wednesday | 68°F | Sunny | 2 to 12 mph NNW | 2% |
| Wednesday Night | 51°F | Mostly Cloudy | 1 to 10 mph WNW | 2% |
| Thursday | 72°F | Patchy Fog then Mostly Sunny | 1 to 5 mph NW | 0% |
| Thursday Night | 49°F | Mostly Clear | 3 mph WNW | 0% |
| Friday | 75°F | Sunny | 1 to 5 mph NNE | 0% |
| Friday Night | 51°F | Mostly Clear | 0 to 5 mph E | 0% |
| Saturday | 77°F | Sunny | 3 mph NE | 0% |
| Saturday Night | 51°F | Mostly Clear | 3 mph NW | 0% |
| Sunday | 74°F | Mostly Sunny | 1 to 5 mph NNW | 0% |
| Sunday Night | 52°F | Partly Cloudy | 1 to 5 mph WNW | 0% |
| Monday | 72°F | Mostly Sunny | 1 to 6 mph WNW | 2% |
| Monday Night | 52°F | Partly Cloudy | 1 to 6 mph W | 2% |
| Tuesday | 72°F | Sunny | 0 to 5 mph NNW | 6% |
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
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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 Nov 4, 2026.