National Weather Service Forecast for: San Marcos CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 am PST Feb 2, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 51. Calm wind.
Partly Cloudy
 Monday

Monday: Mostly sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Mostly Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 51. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 53. Calm wind becoming east around 5 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 85.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 58.
Mostly Clear
 Thursday

Thursday: Partly sunny, with a high near 80.
Partly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 54.
Mostly Cloudy
Lo 51 °F Hi 74 °F Lo 51 °F Hi 78 °F Lo 53 °F Hi 85 °F Lo 58 °F Hi 80 °F Lo 54 °F

 

Overnight
 
 Partly cloudy, with a low around 51. Calm wind.
Monday
 
 Mostly sunny, with a high near 74. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
 
 Partly cloudy, with a low around 51. Calm wind.
Tuesday
 
 Sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
 
 Clear, with a low around 53. Calm wind becoming east around 5 mph.
Wednesday
 
 Sunny, with a high near 85.
Wednesday Night
 
 Mostly clear, with a low around 58.
Thursday
 
 Partly sunny, with a high near 80.
Thursday Night
 
 Mostly cloudy, with a low around 54.
Friday
 
 Partly sunny, with a high near 74.
Friday Night
 
 Partly cloudy, with a low around 52.
Saturday
 
 Sunny, with a high near 74.
Saturday Night
 
 Mostly clear, with a low around 51.
Sunday
 
 Sunny, with a high near 76.

 

Forecast from NOAA-NWS for San Marcos CA.