National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 12:35 pm PST Dec 22, 2025
 
Tonight

Tonight: Patchy fog after 10pm. Otherwise, cloudy, with a low around 52. Calm wind becoming southeast around 5 mph.
Patchy Fog


 Tuesday

Tuesday: Showers likely, mainly after 4pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 64. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Slight Chance
Showers and
Patchy Fog
then Showers
Likely
 Tuesday
Night
Tuesday Night: Showers. The rain could be heavy at times. Low around 54. Southeast wind 10 to 15 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Heavy Rain


 Wednesday

Wednesday: Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 62. Breezy, with a south wind 15 to 25 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Heavy Rain
and Breezy

 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 54. South wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Heavy Rain


 Christmas
Day
Christmas Day: Showers. High near 63. Chance of precipitation is 80%.
Showers


 Thursday
Night
Thursday Night: Showers. Low around 52. Chance of precipitation is 90%.
Showers


 Friday

Friday: Showers. Mostly cloudy, with a high near 60.
Showers


 Friday
Night
Friday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 46.
Showers
Likely
Lo 52 °F Hi 64 °F Lo 54 °F Hi 62 °F Lo 54 °F Hi 63 °F Lo 52 °F Hi 60 °F Lo 46 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Patchy fog after 10pm. Otherwise, cloudy, with a low around 52. Calm wind becoming southeast around 5 mph.
Tuesday
 
 Showers likely, mainly after 4pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 64. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Showers. The rain could be heavy at times. Low around 54. Southeast wind 10 to 15 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Wednesday
 
 Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 62. Breezy, with a south wind 15 to 25 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Wednesday Night
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 54. South wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Christmas Day
 
 Showers. High near 63. Chance of precipitation is 80%.
Thursday Night
 
 Showers. Low around 52. Chance of precipitation is 90%.
Friday
 
 Showers. Mostly cloudy, with a high near 60.
Friday Night
 
 Showers likely, mainly before 10pm. Mostly cloudy, with a low around 46.
Saturday
 
 A slight chance of showers. Mostly sunny, with a high near 60.
Saturday Night
 
 A slight chance of showers. Partly cloudy, with a low around 45.
Sunday
 
 Sunny, with a high near 63.
Sunday Night
 
 Partly cloudy, with a low around 47.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.