Atherton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Atherton, a town in San Mateo County, California.
This Afternoon
82°F
Sunny
Sunny. High near 82, with temperatures falling to around 78 in the afternoon. North northwest wind 5 to 9 mph.
7-day forecast for Atherton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Sunny | 5 to 9 mph NNW | 0% |
| Tonight | 57°F | Mostly Cloudy | 3 to 8 mph WSW | 0% |
| Sunday | 75°F | Mostly Cloudy | 3 to 8 mph WNW | 1% |
| Sunday Night | 58°F | Mostly Cloudy | 2 to 7 mph WSW | 2% |
| Monday | 77°F | Mostly Sunny | 2 to 8 mph WSW | 1% |
| Monday Night | 57°F | Partly Cloudy | 2 to 8 mph WSW | 1% |
| Tuesday | 79°F | Mostly Sunny | 2 to 7 mph WSW | 1% |
| Tuesday Night | 57°F | Mostly Clear | 1 to 7 mph WSW | 0% |
| Wednesday | 87°F | Sunny | 1 to 8 mph W | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 8 mph W | 0% |
| Thursday | 90°F | Sunny | 0 to 8 mph WNW | 0% |
| Thursday Night | 61°F | Mostly Clear | 2 to 8 mph W | 0% |
| Friday | 84°F | Mostly Sunny | 2 to 9 mph W | 0% |
| Friday Night | 58°F | Partly Cloudy | 2 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
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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 Sep 19, 2026.