National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 1:34 am PDT Mar 19, 2026
 
Today

Today: Sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Tonight

Tonight: Clear, with a low around 69. Calm wind.
Clear
 Friday

Friday: Sunny, with a high near 93. Light west wind increasing to 5 to 10 mph in the afternoon.
Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 66. West wind around 5 mph becoming calm.
Mostly Clear
 Saturday

Saturday: Sunny, with a high near 88. Light west wind increasing to 5 to 10 mph in the afternoon.
Sunny
 Saturday
Night
Saturday Night: Mostly cloudy, with a low around 61.
Mostly Cloudy
 Sunday

Sunday: Mostly sunny, with a high near 84.
Mostly Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 62.
Mostly Clear
 Monday

Monday: Sunny, with a high near 87.
Sunny
Hi 93 °F Lo 69 °F Hi 93 °F Lo 66 °F Hi 88 °F Lo 61 °F Hi 84 °F Lo 62 °F Hi 87 °F

Heat Advisory
 

Today
 
 Sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.
Tonight
 
 Clear, with a low around 69. Calm wind.
Friday
 
 Sunny, with a high near 93. Light west wind increasing to 5 to 10 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 66. West wind around 5 mph becoming calm.
Saturday
 
 Sunny, with a high near 88. Light west wind increasing to 5 to 10 mph in the afternoon.
Saturday Night
 
 Mostly cloudy, with a low around 61.
Sunday
 
 Mostly sunny, with a high near 84.
Sunday Night
 
 Mostly clear, with a low around 62.
Monday
 
 Sunny, with a high near 87.
Monday Night
 
 Mostly clear, with a low around 63.
Tuesday
 
 Sunny, with a high near 88.
Tuesday Night
 
 Mostly clear, with a low around 62.
Wednesday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.