National Weather Service Forecast for: Rancho Santa Margarita CA
Issued by: National Weather Service San Diego, CA
Updated: 12:37 am PDT May 4, 2026
 
Today

Today: Cloudy, then gradually becoming mostly sunny, with a high near 64. West wind 5 to 15 mph, with gusts as high as 20 mph.
Decreasing
Clouds
 Tonight

Tonight: A chance of showers after 11pm. Mostly cloudy, with a low around 50. West wind 5 to 10 mph becoming northwest after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Tuesday

Tuesday: A chance of showers before 11am. Partly sunny, with a high near 63. Light northwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers then
Mostly Sunny
 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 49. West wind 5 to 10 mph becoming light and variable in the evening.
Partly Cloudy

 Wednesday

Wednesday: Sunny, with a high near 71. Light and variable wind becoming west 5 to 10 mph in the morning.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 53.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 78.
Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 56.
Mostly Clear

 Friday

Friday: Sunny, with a high near 81.
Sunny
Hi 64 °F Lo 50 °F Hi 63 °F Lo 49 °F Hi 71 °F Lo 53 °F Hi 78 °F Lo 56 °F Hi 81 °F

 

Today
 
 Cloudy, then gradually becoming mostly sunny, with a high near 64. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
 
 A chance of showers after 11pm. Mostly cloudy, with a low around 50. West wind 5 to 10 mph becoming northwest after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 A chance of showers before 11am. Partly sunny, with a high near 63. Light northwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Partly cloudy, with a low around 49. West wind 5 to 10 mph becoming light and variable in the evening.
Wednesday
 
 Sunny, with a high near 71. Light and variable wind becoming west 5 to 10 mph in the morning.
Wednesday Night
 
 Mostly clear, with a low around 53.
Thursday
 
 Sunny, with a high near 78.
Thursday Night
 
 Mostly clear, with a low around 56.
Friday
 
 Sunny, with a high near 81.
Friday Night
 
 Mostly clear, with a low around 58.
Saturday
 
 Sunny, with a high near 83.
Saturday Night
 
 Mostly clear, with a low around 59.
Sunday
 
 Sunny, with a high near 86.

 

Forecast from NOAA-NWS for Rancho Santa Margarita CA.