National Weather Service Forecast for: Mission Viejo CA
Issued by: National Weather Service San Diego, CA
Updated: 12:34 am PDT Aug 20, 2026
 
Overnight

Overnight: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 67. Calm wind.
Patchy Fog

 Thursday

Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm.
Partly Cloudy
then Patchy
Fog
 Friday

Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 68. South wind around 5 mph becoming calm in the evening.
Mostly Clear

 Saturday

Saturday: Patchy fog before 11am. Otherwise, sunny, with a high near 90.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 69.
Mostly Clear

 Sunday

Sunday: Patchy fog before 11am. Otherwise, sunny, with a high near 90.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 68.
Mostly Clear
Lo 67 °F Hi 89 °F Lo 67 °F Hi 89 °F Lo 68 °F Hi 90 °F Lo 69 °F Hi 90 °F Lo 68 °F

 

Overnight
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 67. Calm wind.
Thursday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Thursday Night
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm.
Friday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 89. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 68. South wind around 5 mph becoming calm in the evening.
Saturday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 90.
Saturday Night
 
 Mostly clear, with a low around 69.
Sunday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 90.
Sunday Night
 
 Mostly clear, with a low around 68.
Monday
 
 Sunny, with a high near 91.
Monday Night
 
 Mostly clear, with a low around 69.
Tuesday
 
 Sunny, with a high near 92.
Tuesday Night
 
 Mostly clear, with a low around 70.
Wednesday
 
 Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Mission Viejo CA.