National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 12:04 pm PST Feb 1, 2026
 
Tonight

Tonight: Mostly clear, with a low around 55. Calm wind.
Mostly Clear
 Monday

Monday: Mostly sunny, with a high near 74. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 55. Calm wind.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 58. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 86.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 60.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 80.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 57.
Mostly Cloudy
Lo 55 °F Hi 74 °F Lo 55 °F Hi 80 °F Lo 58 °F Hi 86 °F Lo 60 °F Hi 80 °F Lo 57 °F

 

Tonight
 
 Mostly clear, with a low around 55. Calm wind.
Monday
 
 Mostly sunny, with a high near 74. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 55. Calm wind.
Tuesday
 
 Sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
 
 Clear, with a low around 58. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
 
 Sunny, with a high near 86.
Wednesday Night
 
 Mostly clear, with a low around 60.
Thursday
 
 Mostly sunny, with a high near 80.
Thursday Night
 
 Mostly cloudy, with a low around 57.
Friday
 
 Mostly sunny, with a high near 73.
Friday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 54.
Saturday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 73.
Saturday Night
 
 Partly cloudy, with a low around 55.
Sunday
 
 Sunny, with a high near 76.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.