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.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. West wind around 10 mph.
7-day forecast for San Marcos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 10 mph W | 0% |
| Tonight | 57°F | Partly Cloudy | 5 mph N | 9% |
| Wednesday | 74°F | Sunny | 0 to 5 mph S | 0% |
| Wednesday Night | 56°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Thursday | 77°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 58°F | Mostly Clear | 0 to 5 mph N | 0% |
| Friday | 82°F | Sunny | 0 to 5 mph N | 0% |
| Friday Night | 58°F | Clear | 0 to 5 mph NE | 0% |
| Saturday | 86°F | Sunny | 0 to 5 mph N | 0% |
| Saturday Night | 61°F | Mostly Clear | 5 to 10 mph NE | 0% |
| Sunday | 87°F | Sunny | 5 to 10 mph NW | 0% |
| Sunday Night | 64°F | Partly Cloudy | 5 to 10 mph NE | 0% |
| Monday | 84°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 62°F | Partly Cloudy | 0 to 5 mph N | 1% |
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
Nearby towns & communities
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Bonsall
Borrego Springs
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Campo
Carlsbad
Casa de Oro-Mount Helix
Chula Vista
Coronado
Crest
Del Dios
Del Mar
Descanso
El Cajon
Elfin Forest
Encinitas
Escondido
Eucalyptus Hills
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Harbison Canyon
Harmony Grove
Hidden Meadows
Imperial Beach
Jacumba
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 Nov 4, 2026.