Half Moon Bay, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Half Moon Bay, a city in San Mateo County, California.
This Afternoon
67°F
Partly Sunny
Partly sunny. High near 67, with temperatures falling to around 64 in the afternoon. West northwest wind around 9 mph.
7-day forecast for Half Moon Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Partly Sunny | 9 mph WNW | 0% |
| Tonight | 55°F | Mostly Cloudy | 2 to 8 mph WNW | 1% |
| Saturday | 68°F | Patchy Fog then Partly Sunny | 2 to 8 mph WNW | 0% |
| Saturday Night | 55°F | Cloudy | 3 to 7 mph WNW | 2% |
| Sunday | 64°F | Cloudy | 5 to 8 mph WNW | 4% |
| Sunday Night | 55°F | Cloudy | 2 to 7 mph WNW | 4% |
| Monday | 65°F | Mostly Cloudy | 2 to 7 mph W | 2% |
| Monday Night | 55°F | Patchy Fog | 2 to 6 mph W | 2% |
| Tuesday | 66°F | Patchy Fog then Partly Sunny | 2 to 7 mph W | 2% |
| Tuesday Night | 55°F | Patchy Fog | 1 to 7 mph W | 0% |
| Wednesday | 73°F | Patchy Fog then Mostly Sunny | 1 to 6 mph W | 0% |
| Wednesday Night | 57°F | Mostly Cloudy | 0 to 6 mph NW | 0% |
| Thursday | 74°F | Mostly Sunny | 0 to 6 mph NW | 0% |
| Thursday Night | 57°F | Mostly Cloudy | 2 to 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Half Moon Bay (37.467, -122.440). Updated through the day.
Growing snapshot for Half Moon Bay
Last spring frost
Feb 6
First fall frost
Dec 17
Growing season
328 days
Hardiness zone
10a
More local growing data for Half Moon Bay: nearby ZIP 94019 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Half Moon Bay, Ca (2.3 mi from Half Moon Bay). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.