San Marcos, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for San Marcos, a city in San Diego County, California.

Overnight

66°F

Patchy Fog

Patchy fog. Mostly cloudy, with a low around 66. South wind 0 to 5 mph.

7-day forecast for San Marcos

When	Temp	Forecast	Wind	Precip
Overnight	66°F	Patchy Fog	0 to 5 mph S	0%
Tuesday	82°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Tuesday Night	66°F	Patchy Fog	0 to 5 mph SW	0%
Wednesday	81°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Wednesday Night	66°F	Partly Cloudy then Patchy Fog	0 to 5 mph SW	0%
Thursday	83°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Thursday Night	67°F	Patchy Fog	0 to 5 mph SW	0%
Friday	83°F	Patchy Fog then Sunny	0 to 10 mph SW	0%
Friday Night	66°F	Partly Cloudy	0 to 5 mph SW	0%
Saturday	86°F	Sunny	0 to 10 mph SW	0%
Saturday Night	67°F	Mostly Clear	0 to 5 mph SW	0%
Sunday	85°F	Sunny	0 to 10 mph SW	1%
Sunday Night	66°F	Partly Cloudy	0 to 5 mph S	2%
Monday	83°F	Mostly Sunny	0 to 10 mph S	5%

Forecast source: National Weather Service (api.weather.gov) for San Marcos (33.133, -117.170). Updated through the day.

Growing snapshot for San Marcos

Last spring frost

Jan 2

First fall frost

Dec 30

Growing season

365 days

Hardiness zone

10a

More local growing data for San Marcos: nearby ZIP 92096 weather · frost dates · planting calendar · California frost dates

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All California locations ›

Climate data from the nearest NOAA station, Escondido #2, Ca (3.9 mi from San Marcos). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.