Millbrae, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Millbrae, a city in San Mateo County, California.
Today
64°F
Light Rain Likely
Rain likely. Mostly cloudy. High near 64, with temperatures falling to around 58 in the afternoon. South southwest wind 6 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Millbrae
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Light Rain Likely | 6 to 14 mph SSW | 65% |
| Tonight | 51°F | Chance Light Rain then Mostly Cloudy | 6 to 9 mph ESE | 37% |
| Wednesday | 65°F | Sunny | 5 to 16 mph NNE | 3% |
| Wednesday Night | 53°F | Mostly Cloudy | 2 to 16 mph NW | 0% |
| Thursday | 68°F | Sunny | 2 to 8 mph NNW | 0% |
| Thursday Night | 53°F | Mostly Clear | 2 to 9 mph NNW | 0% |
| Friday | 71°F | Sunny | 1 to 6 mph N | 0% |
| Friday Night | 54°F | Clear | 1 to 6 mph N | 0% |
| Saturday | 75°F | Sunny | 5 mph NNE | 0% |
| Saturday Night | 55°F | Mostly Clear | 3 to 7 mph NW | 0% |
| Sunday | 72°F | Mostly Sunny | 2 to 7 mph NNW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 2 to 7 mph NW | 0% |
| Monday | 70°F | Partly Sunny | 2 to 8 mph NW | 1% |
| Monday Night | 55°F | Partly Cloudy | 2 to 8 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Millbrae (37.599, -122.402). Updated through the day.
Growing snapshot for Millbrae
Last spring frost
Dec 29
First fall frost
Dec 26
Growing season
365 days
Hardiness zone
10a
More local growing data for Millbrae: nearby ZIP 94030 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Francisco Intl Ap, Ca (2.5 mi from Millbrae). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.