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.

This Afternoon

74°F

Sunny

Sunny, with a high near 74. West wind around 10 mph.

7-day forecast for Lake San Marcos

When	Temp	Forecast	Wind	Precip
This Afternoon	74°F	Sunny	10 mph W	0%
Tonight	62°F	Partly Cloudy	0 to 5 mph S	1%
Saturday	77°F	Sunny	0 to 10 mph NW	1%
Saturday Night	62°F	Partly Cloudy	0 to 5 mph E	0%
Sunday	75°F	Partly Sunny	0 to 10 mph SE	0%
Sunday Night	63°F	Mostly Cloudy	0 to 5 mph SW	2%
Monday	75°F	Mostly Sunny	0 to 10 mph SW	0%
Monday Night	62°F	Partly Cloudy	0 to 10 mph E	1%
Tuesday	76°F	Sunny	5 to 10 mph N	0%
Tuesday Night	63°F	Mostly Clear	0 to 10 mph NW	0%
Wednesday	81°F	Sunny	0 to 10 mph N	2%
Wednesday Night	65°F	Mostly Clear	0 to 5 mph NW	2%
Thursday	83°F	Sunny	0 to 10 mph N	2%
Thursday Night	67°F	Partly Cloudy	0 to 5 mph NW	1%

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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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 Sep 19, 2026.