National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 2:23 am PDT Jun 30, 2026
 
Overnight

Overnight: Patchy drizzle. Mostly cloudy, with a low around 55. South wind around 5 mph becoming calm.
Patchy
Drizzle
 Tuesday

Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 72. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Decreasing
Clouds
 Tuesday
Night
Tuesday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. Southwest wind around 5 mph becoming calm in the evening.
Patchy Fog
 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 74. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 54. Southwest wind around 5 mph becoming calm in the evening.
Patchy Fog
 Thursday

Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 76.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 55.
Patchy Fog
 Friday

Friday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 79.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Lo 55 °F Hi 72 °F Lo 54 °F Hi 74 °F Lo 54 °F Hi 76 °F Lo 55 °F Hi 79 °F Lo 56 °F

 

Overnight
 
 Patchy drizzle. Mostly cloudy, with a low around 55. South wind around 5 mph becoming calm.
Tuesday
 
 Cloudy, then gradually becoming mostly sunny, with a high near 72. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 54. Southwest wind around 5 mph becoming calm in the evening.
Wednesday
 
 Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 74. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Wednesday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 54. Southwest wind around 5 mph becoming calm in the evening.
Thursday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 76.
Thursday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 55.
Friday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 79.
Friday Night
 
 Partly cloudy, with a low around 56.
Independence Day
 
 Mostly sunny, with a high near 81.
Saturday Night
 
 Partly cloudy, with a low around 58.
Sunday
 
 Sunny, with a high near 80.
Sunday Night
 
 Mostly clear, with a low around 58.
Monday
 
 Sunny, with a high near 81.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.