National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 8:38 pm PDT Jun 29, 2026
 
Overnight

Overnight: Patchy drizzle after 2am. Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 56. East wind around 5 mph.
Patchy
Drizzle and
Patchy Fog
 Tuesday

Tuesday: Patchy drizzle before 11am. Partly sunny, with a high near 73. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Patchy
Drizzle then
Mostly Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 55. 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 75. Southeast wind 5 to 10 mph becoming southwest 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.
Patchy Fog

 Thursday

Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 77.
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 80.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Lo 56 °F Hi 73 °F Lo 55 °F Hi 75 °F Lo 54 °F Hi 77 °F Lo 55 °F Hi 80 °F Lo 56 °F

 

Overnight
 
 Patchy drizzle after 2am. Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 56. East wind around 5 mph.
Tuesday
 
 Patchy drizzle before 11am. Partly sunny, with a high near 73. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Tuesday Night
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 55. 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 75. Southeast wind 5 to 10 mph becoming southwest in the afternoon.
Wednesday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 54. Southwest wind around 5 mph becoming calm.
Thursday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 77.
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 80.
Friday Night
 
 Partly cloudy, with a low around 56.
Independence Day
 
 Mostly sunny, with a high near 82.
Saturday Night
 
 Partly cloudy, with a low around 57.
Sunday
 
 Mostly sunny, with a high near 82.
Sunday Night
 
 Partly cloudy, with a low around 57.
Monday
 
 Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.