Lake San Marcos, CA Weather & Growing Conditions

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

Today

80°F

Patchy Fog then Sunny

Patchy fog before 11am. Sunny, with a high near 80. Southwest wind 5 to 10 mph.

7-day forecast for Lake San Marcos

When	Temp	Forecast	Wind	Precip
Today	80°F	Patchy Fog then Sunny	5 to 10 mph SW	0%
Tonight	66°F	Patchy Fog	0 to 5 mph SW	0%
Wednesday	80°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Wednesday Night	66°F	Patchy Fog	0 to 5 mph SW	0%
Thursday	81°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Thursday Night	67°F	Patchy Fog	0 to 5 mph W	0%
Friday	81°F	Patchy Fog then Mostly Sunny	0 to 10 mph SW	0%
Friday Night	67°F	Partly Cloudy	0 to 5 mph SW	0%
Saturday	83°F	Sunny	0 to 10 mph SW	0%
Saturday Night	67°F	Partly Cloudy	0 to 5 mph SW	0%
Sunday	83°F	Mostly Sunny	0 to 10 mph SW	1%
Sunday Night	66°F	Partly Cloudy	0 to 5 mph SW	2%
Monday	82°F	Mostly Sunny	0 to 10 mph S	5%
Monday Night	66°F	Partly Cloudy	0 to 10 mph SE	3%

Forecast source: National Weather Service (api.weather.gov) for Lake San Marcos (33.122, -117.209). Updated through the day.

Growing snapshot for Lake San Marcos

Last spring frost

Jan 2

First fall frost

Dec 30

Growing season

365 days

Hardiness zone

10a

More local growing data for Lake San Marcos: nearby ZIP 92078 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 (5.3 mi from Lake San Marcos). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.