National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 pm PDT Jun 19, 2026
 
Tonight

Tonight: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. West wind around 5 mph becoming calm in the evening.
Patchy Fog
 Saturday

Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 76. Light west wind increasing to 5 to 10 mph in the morning.
Becoming
Sunny
 Saturday
Night
Saturday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. West wind around 5 mph becoming calm in the evening.
Patchy Fog
 Sunday

Sunday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 55. West wind around 5 mph becoming calm in the evening.
Patchy Fog
 Monday

Monday: Patchy fog before 11am. Otherwise, sunny, with a high near 80.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 55.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 85.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 58.
Mostly Clear
Lo 54 °F Hi 76 °F Lo 54 °F Hi 78 °F Lo 55 °F Hi 80 °F Lo 55 °F Hi 85 °F Lo 58 °F

 

Tonight
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. West wind around 5 mph becoming calm in the evening.
Saturday
 
 Mostly cloudy through mid morning, then gradual clearing, with a high near 76. Light west wind increasing to 5 to 10 mph in the morning.
Saturday Night
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. West wind around 5 mph becoming calm in the evening.
Sunday
 
 Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 55. West wind around 5 mph becoming calm in the evening.
Monday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 80.
Monday Night
 
 Mostly clear, with a low around 55.
Tuesday
 
 Sunny, with a high near 85.
Tuesday Night
 
 Mostly clear, with a low around 58.
Wednesday
 
 Sunny, with a high near 89.
Wednesday Night
 
 Mostly clear, with a low around 59.
Thursday
 
 Sunny, with a high near 89.
Thursday Night
 
 Mostly clear, with a low around 58.
Friday
 
 Sunny, with a high near 83.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.