National Weather Service Forecast for: Ontario International Arpt CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 am PST Feb 2, 2026
 
Today

Today: Sunny, with a high near 78. Light southwest wind becoming west 5 to 10 mph in the afternoon.
Sunny
 Tonight

Tonight: Mostly clear, with a low around 51. West wind around 5 mph becoming calm in the evening.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 83. Calm wind becoming north around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 53. Calm wind becoming north around 5 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 84. Northeast 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: Mostly clear, with a low around 55.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 82.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 53.
Mostly Cloudy
 Friday

Friday: Partly sunny, with a high near 76.
Partly Sunny
Hi 78 °F Lo 51 °F Hi 83 °F Lo 53 °F Hi 84 °F Lo 55 °F Hi 82 °F Lo 53 °F Hi 76 °F

Air Quality Alert
 

Today
 
 Sunny, with a high near 78. Light southwest wind becoming west 5 to 10 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 51. West wind around 5 mph becoming calm in the evening.
Tuesday
 
 Sunny, with a high near 83. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
 
 Clear, with a low around 53. Calm wind becoming north around 5 mph.
Wednesday
 
 Sunny, with a high near 84. Northeast wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
 
 Mostly clear, with a low around 55.
Thursday
 
 Mostly sunny, with a high near 82.
Thursday Night
 
 Mostly cloudy, with a low around 53.
Friday
 
 Partly sunny, with a high near 76.
Friday Night
 
 Partly cloudy, with a low around 51.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 51.
Sunday
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for Ontario International Arpt CA.