Ontario Airport (ONT) Weather 08/02/2026
Tonight
66
Increasing Clouds
Thursday
97
Becoming Sunny
Thursday Night
67
Clear
Friday
101
Sunny
Friday Night
70
Mostly Clear
Saturday
103
Sunny
Saturday Night
70
Mostly Clear
Sunday
101
Sunny
Sunday Night
69
Clear
Monday
99
Sunny
Monday Night
69
Clear
Tuesday
99
Sunny
Tuesday Night
69
Clear
Weekly Forecast
Tonight
Increasing clouds, with a low around 66. West wind 5 to 10 mph.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 97. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Clear, with a low around 67. West wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 101. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Saturday
Sunny, with a high near 103.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 101.
Sunday Night
Clear, with a low around 69.
Monday
Sunny, with a high near 99.
Monday Night
Clear, with a low around 69.
Tuesday
Sunny, with a high near 99.
Tuesday Night
Clear, with a low around 69.