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
64°F
Light Rain Likely
Rain likely. Partly sunny. High near 64, with temperatures falling to around 60 in the afternoon. South southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Half Moon Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Light Rain Likely | 5 to 10 mph SSW | 63% |
| Tonight | 46°F | Chance Light Rain then Mostly Cloudy | 5 mph SE | 37% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NNE | 3% |
| Wednesday Night | 49°F | Mostly Cloudy | 3 to 10 mph NNW | 0% |
| Thursday | 67°F | Mostly Sunny | 3 to 8 mph NNW | 0% |
| Thursday Night | 48°F | Partly Cloudy then Patchy Fog | 2 to 8 mph NNW | 0% |
| Friday | 69°F | Patchy Fog then Sunny | 2 to 7 mph N | 0% |
| Friday Night | 51°F | Mostly Clear | 1 to 7 mph N | 0% |
| Saturday | 70°F | Sunny | 2 to 6 mph NNE | 0% |
| Saturday Night | 54°F | Partly Cloudy | 6 mph NNW | 0% |
| Sunday | 69°F | Mostly Sunny | 3 to 8 mph NNW | 0% |
| Sunday Night | 54°F | Mostly Cloudy then Patchy Fog | 2 to 8 mph NW | 0% |
| Monday | 66°F | Patchy Fog then Mostly Cloudy | 2 to 8 mph NNW | 1% |
| Monday Night | 52°F | Mostly Cloudy then Patchy Fog | 2 to 8 mph NNW | 2% |
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 Nov 4, 2026.