San Marcos, CA Weather & Growing Conditions
Today
78°F
Sunny
Sunny, with a high near 78. West wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 0 to 10 mph W | 0% |
| Tonight | 62°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Sunday | 77°F | Mostly Sunny | 0 to 10 mph W | 5% |
| Sunday Night | 63°F | Mostly Cloudy | 0 to 5 mph SW | 5% |
| Monday | 76°F | Mostly Sunny | 0 to 10 mph S | 1% |
| Monday Night | 61°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Tuesday | 77°F | Sunny | 0 to 10 mph W | 0% |
| Tuesday Night | 62°F | Mostly Clear | 0 to 10 mph N | 0% |
| Wednesday | 81°F | Sunny | 0 to 10 mph N | 0% |
| Wednesday Night | 64°F | Mostly Clear | 0 to 5 mph N | 0% |
| Thursday | 83°F | Sunny | 0 to 10 mph NW | 2% |
| Thursday Night | 65°F | Mostly Clear | 0 to 5 mph NW | 4% |
| Friday | 85°F | Sunny | 0 to 10 mph NW | 3% |
| Friday Night | 67°F | Partly Cloudy | 0 to 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Marcos, CA
Last spring frost
Jan 2
First fall frost
Dec 30
Growing season
365 days
Hardiness zone
10a
Explore more for San Marcos, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Escondido #2, Ca (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.