National Weather Service Forecast for: Ontario International Arpt CA
Issued by: National Weather Service San Diego, CA
Updated: 1:51 pm PDT May 30, 2025
 
Tonight

Tonight: Partly cloudy, with a low around 66. West wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Partly Cloudy
 Saturday

Saturday: Partly sunny, with a high near 94. Calm wind becoming west around 5 mph in the afternoon.
Partly Sunny
 Saturday
Night
Saturday Night: A slight chance of showers. Mostly cloudy, with a low around 67. West wind 5 to 10 mph becoming light and variable after midnight. Chance of precipitation is 20%.
Slight Chance
Showers
 Sunday

Sunday: A chance of showers, mainly before 11am. Mostly cloudy, with a high near 86. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Sunday
Night
Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 62. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Decreasing
Clouds
 Monday

Monday: Sunny, with a high near 83.
Sunny
 Monday
Night
Monday Night: Increasing clouds, with a low around 58.
Increasing
Clouds
 Tuesday

Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 81.
Becoming
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 59.
Mostly Clear
Lo 66 °F Hi 94 °F Lo 67 °F Hi 86 °F Lo 62 °F Hi 83 °F Lo 58 °F Hi 81 °F Lo 59 °F

 

Tonight
 
 Partly cloudy, with a low around 66. West wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Saturday
 
 Partly sunny, with a high near 94. Calm wind becoming west around 5 mph in the afternoon.
Saturday Night
 
 A slight chance of showers. Mostly cloudy, with a low around 67. West wind 5 to 10 mph becoming light and variable after midnight. Chance of precipitation is 20%.
Sunday
 
 A chance of showers, mainly before 11am. Mostly cloudy, with a high near 86. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
 
 Mostly cloudy, then gradually becoming mostly clear, with a low around 62. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
 
 Sunny, with a high near 83.
Monday Night
 
 Increasing clouds, with a low around 58.
Tuesday
 
 Mostly cloudy through mid morning, then gradual clearing, with a high near 81.
Tuesday Night
 
 Mostly clear, with a low around 59.
Wednesday
 
 Sunny, with a high near 83.
Wednesday Night
 
 Mostly clear, with a low around 60.
Thursday
 
 Sunny, with a high near 87.
Thursday Night
 
 Mostly clear, with a low around 61.
Friday
 
 Sunny, with a high near 88.

 

Forecast from NOAA-NWS for Ontario International Arpt CA.