National Weather Service Forecast for: Rialto CA
Issued by: National Weather Service San Diego, CA
Updated: 2:09 am PDT Jul 25, 2025
 
Overnight

Overnight: Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm.
Mostly Clear

Friday

Friday: Sunny, with a high near 85. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Sunny

Friday
Night
Friday Night: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light south  after midnight. Winds could gust as high as 20 mph.
Mostly Clear
then Patchy
Fog
Saturday

Saturday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 83. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
Saturday
Night
Saturday Night: Mostly clear, with a low around 58. Southwest wind 5 to 15 mph.
Mostly Clear

Sunday

Sunday: Sunny, with a high near 88.
Sunny

Sunday
Night
Sunday Night: Mostly clear, with a low around 61.
Mostly Clear

Monday

Monday: Sunny, with a high near 92.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 64.
Mostly Clear

Lo 58 °F Hi 85 °F Lo 57 °F Hi 83 °F Lo 58 °F Hi 88 °F Lo 61 °F Hi 92 °F Lo 64 °F

 

Overnight
 
Mostly clear, with a low around 58. Southwest wind around 5 mph becoming calm.
Friday
 
Sunny, with a high near 85. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
 
Patchy fog after 2am. Otherwise, mostly clear, with a low around 57. Southwest wind 5 to 10 mph becoming light south after midnight. Winds could gust as high as 20 mph.
Saturday
 
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Saturday Night
 
Mostly clear, with a low around 58. Southwest wind 5 to 15 mph.
Sunday
 
Sunny, with a high near 88.
Sunday Night
 
Mostly clear, with a low around 61.
Monday
 
Sunny, with a high near 92.
Monday Night
 
Mostly clear, with a low around 64.
Tuesday
 
Sunny, with a high near 95.
Tuesday Night
 
Mostly clear, with a low around 65.
Wednesday
 
Sunny, with a high near 95.
Wednesday Night
 
Mostly clear, with a low around 66.
Thursday
 
Sunny, with a high near 94.

 

Forecast from NOAA-NWS for Rialto CA.