Millbrae, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Millbrae, a city in San Mateo County, California.
Overnight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. Southwest wind around 5 mph.
7-day forecast for Millbrae
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Partly Cloudy | 5 mph SW | 0% |
| Tuesday | 81°F | Haze then Sunny | 2 to 12 mph WSW | 0% |
| Tuesday Night | 56°F | Mostly Clear | 3 to 10 mph SW | 1% |
| Wednesday | 80°F | Sunny | 3 to 10 mph WSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 2 to 10 mph WSW | 0% |
| Thursday | 79°F | Mostly Sunny | 1 to 10 mph WSW | 0% |
| Thursday Night | 58°F | Mostly Clear | 2 to 10 mph W | 0% |
| Friday | 82°F | Sunny | 2 to 12 mph W | 0% |
| Friday Night | 59°F | Mostly Clear | 3 to 12 mph W | 0% |
| Saturday | 79°F | Sunny | 2 to 12 mph WSW | 0% |
| Saturday Night | 60°F | Mostly Clear | 8 to 12 mph WSW | 0% |
| Sunday | 76°F | Sunny | 8 to 15 mph WSW | 0% |
| Sunday Night | 58°F | Mostly Clear | 9 to 15 mph WSW | 0% |
| Monday | 73°F | Sunny | 9 to 15 mph WSW | 0% |
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 Aug 4, 2026.