National Weather Service Forecast for: Rialto CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 pm PDT Jun 19, 2026
 
Tonight

Tonight: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Clear
 Saturday

Saturday: Patchy fog before 11am. Otherwise, sunny, with a high near 82. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 83. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunny
 Sunday
Night
Sunday Night: Clear, with a low around 58. Southwest wind 5 to 10 mph becoming light northwest after midnight.
Clear
 Monday

Monday: Sunny, with a high near 89.
Sunny
 Monday
Night
Monday Night: Clear, with a low around 61.
Clear
 Tuesday

Tuesday: Sunny, with a high near 95.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 64.
Mostly Clear
Lo 56 °F Hi 82 °F Lo 56 °F Hi 83 °F Lo 58 °F Hi 89 °F Lo 61 °F Hi 95 °F Lo 64 °F

 

Tonight
 
 Mostly clear, with a low around 56. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 82. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
 
 Mostly clear, with a low around 56. Southwest wind 5 to 10 mph.
Sunday
 
 Sunny, with a high near 83. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
 
 Clear, with a low around 58. Southwest wind 5 to 10 mph becoming light northwest after midnight.
Monday
 
 Sunny, with a high near 89.
Monday Night
 
 Clear, with a low around 61.
Tuesday
 
 Sunny, with a high near 95.
Tuesday Night
 
 Mostly clear, with a low around 64.
Wednesday
 
 Sunny, with a high near 97.
Wednesday Night
 
 Mostly clear, with a low around 65.
Thursday
 
 Sunny, with a high near 96.
Thursday Night
 
 Clear, with a low around 64.
Friday
 
 Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Rialto CA.