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.
Today
69°F
Slight Chance Drizzle then Partly Sunny
A slight chance of drizzle before 9am. Partly sunny. High near 69, with temperatures falling to around 66 in the afternoon. South southwest wind 5 to 8 mph. Chance of precipitation is 20%.
7-day forecast for Half Moon Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Slight Chance Drizzle then Partly Sunny | 5 to 8 mph SSW | 15% |
| Tonight | 56°F | Mostly Cloudy | 2 to 6 mph SSW | 1% |
| Wednesday | 70°F | Partly Sunny | 3 to 7 mph SSW | 0% |
| Wednesday Night | 57°F | Patchy Fog | 0 to 6 mph SSW | 0% |
| Thursday | 70°F | Patchy Fog then Partly Sunny | 0 to 6 mph WSW | 0% |
| Thursday Night | 57°F | Mostly Cloudy | 0 to 6 mph NW | 0% |
| Friday | 72°F | Partly Sunny | 1 to 7 mph WNW | 0% |
| Friday Night | 58°F | Mostly Cloudy | 1 to 7 mph WNW | 0% |
| Saturday | 70°F | Partly Sunny | 1 to 7 mph W | 0% |
| Saturday Night | 58°F | Mostly Cloudy | 3 to 7 mph W | 0% |
| Sunday | 67°F | Mostly Sunny | 3 to 8 mph W | 0% |
| Sunday Night | 57°F | Mostly Cloudy | 5 to 8 mph W | 0% |
| Monday | 65°F | Partly Sunny | 5 to 9 mph WSW | 0% |
| Monday Night | 56°F | Mostly Cloudy | 5 to 8 mph WSW | 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 Aug 4, 2026.