National Weather Service Forecast for: Rialto CA
Issued by: National Weather Service San Diego, CA
Updated: 2:23 am PDT Jun 30, 2026
 
Overnight

Overnight: Mostly cloudy, with a low around 57. West wind around 5 mph.
Mostly Cloudy

 Tuesday

Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Becoming
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 57. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Mostly Clear
then Patchy
Fog
 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Clear, with a low around 57. Southwest wind 5 to 10 mph becoming light in the evening.
Clear

 Thursday

Thursday: Sunny, with a high near 84.
Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 59.
Mostly Clear

 Friday

Friday: Sunny, with a high near 87.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 60.
Mostly Clear
Lo 57 °F Hi 79 °F Lo 57 °F Hi 81 °F Lo 57 °F Hi 84 °F Lo 59 °F Hi 87 °F Lo 60 °F

 

Overnight
 
 Mostly cloudy, with a low around 57. West wind around 5 mph.
Tuesday
 
 Mostly cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Patchy fog after 2am. Otherwise, increasing clouds, with a low around 57. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Wednesday
 
 Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 81. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
 Clear, with a low around 57. Southwest wind 5 to 10 mph becoming light in the evening.
Thursday
 
 Sunny, with a high near 84.
Thursday Night
 
 Mostly clear, with a low around 59.
Friday
 
 Sunny, with a high near 87.
Friday Night
 
 Mostly clear, with a low around 60.
Independence Day
 
 Sunny, with a high near 90.
Saturday Night
 
 Mostly clear, with a low around 62.
Sunday
 
 Sunny, with a high near 91.
Sunday Night
 
 Mostly clear, with a low around 63.
Monday
 
 Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Rialto CA.