San Marcos, CA Weather & Growing Conditions
Tonight
57°F
Partly Cloudy
Partly cloudy, with a low around 57. North wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Partly Cloudy | 0 to 5 mph N | 7% |
| Wednesday | 73°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Thursday | 77°F | Sunny | 0 to 5 mph W | 0% |
| Thursday Night | 57°F | Mostly Clear | 0 to 5 mph N | 0% |
| Friday | 82°F | Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 58°F | Clear | 5 to 10 mph NE | 0% |
| Saturday | 85°F | Sunny | 0 to 5 mph N | 0% |
| Saturday Night | 61°F | Mostly Clear | 5 to 10 mph NE | 0% |
| Sunday | 86°F | Sunny | 5 to 10 mph NW | 0% |
| Sunday Night | 63°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Monday | 83°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 61°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Tuesday | 81°F | Mostly Sunny | 0 to 5 mph W | 2% |
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 Nov 4, 2026.