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

Today: Partly sunny, with a high near 67. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Partly Sunny

 Tonight

Tonight: A slight chance of showers after 11pm. Mostly cloudy, with a low around 51. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Slight Chance
Showers
 Tuesday

Tuesday: A slight chance of showers before 11am. Partly sunny, with a high near 67. Southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Slight Chance
Showers then
Partly Sunny
 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 52. Southwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Partly Cloudy

 Wednesday

Wednesday: Sunny, with a high near 78. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Sunny

 Wednesday
Night
Wednesday Night: Clear, with a low around 56.
Clear

 Thursday

Thursday: Sunny, with a high near 86.
Sunny

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

 Friday

Friday: Sunny, with a high near 89.
Sunny
Hi 67 °F Lo 51 °F Hi 67 °F Lo 52 °F Hi 78 °F Lo 56 °F Hi 86 °F Lo 59 °F Hi 89 °F

 

Today
 
 Partly sunny, with a high near 67. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
 
 A slight chance of showers after 11pm. Mostly cloudy, with a low around 51. Southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tuesday
 
 A slight chance of showers before 11am. Partly sunny, with a high near 67. Southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tuesday Night
 
 Partly cloudy, with a low around 52. Southwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Wednesday
 
 Sunny, with a high near 78. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
 
 Clear, with a low around 56.
Thursday
 
 Sunny, with a high near 86.
Thursday Night
 
 Clear, with a low around 59.
Friday
 
 Sunny, with a high near 89.
Friday Night
 
 Clear, with a low around 62.
Saturday
 
 Sunny, with a high near 93.
Saturday Night
 
 Clear, with a low around 64.
Sunday
 
 Sunny, with a high near 96.

 

Forecast from NOAA-NWS for Rialto CA.