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San Miguel, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for San Miguel, a community in Contra Costa County, California.

Overnight
59°F
Clear
Clear, with a low around 59. South southwest wind around 3 mph.

7-day forecast for San Miguel

WhenTempForecastWindPrecip
Overnight 59°F Clear 3 mph SSW 0%
Tuesday 101°F Sunny 3 to 8 mph SW 0%
Tuesday Night 58°F Clear 3 to 7 mph SW 0%
Wednesday 96°F Sunny 3 to 8 mph SW 0%
Wednesday Night 59°F Clear 3 to 8 mph WSW 0%
Thursday 94°F Sunny 3 to 8 mph WSW 0%
Thursday Night 60°F Clear 3 to 8 mph WSW 0%
Friday 98°F Sunny 3 to 8 mph WSW 0%
Friday Night 62°F Clear 5 to 8 mph SW 0%
Saturday 98°F Sunny 5 to 8 mph WSW 0%
Saturday Night 63°F Mostly Clear 8 mph SW 0%
Sunday 92°F Sunny 9 mph SW 0%
Sunday Night 59°F Mostly Clear 10 mph SW 0%
Monday 86°F Sunny 10 mph SW 0%

Forecast source: National Weather Service (api.weather.gov) for San Miguel (37.887, -122.037). Updated through the day.

Growing snapshot for San Miguel

Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b

More local growing data for San Miguel: nearby ZIP 94596 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.8 mi from San Miguel). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.