Ontario Airport (ONT) Weather 07/13/2026
Today
79
Sunny
Tonight
57
Increasing Clouds
Thursday
83
Becoming Sunny
Thursday Night
58
Mostly Clear
Friday
87
Sunny
Friday Night
60
Mostly Clear
Independence Day
88
Mostly Sunny
Saturday Night
61
Partly Cloudy
Sunday
89
Sunny
Sunday Night
61
Mostly Clear
Monday
89
Sunny
Monday Night
62
Mostly Clear
Tuesday
91
Sunny
Weekly Forecast
Today
Sunny, with a high near 79. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 57. West wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, then gradually becoming sunny, with a high near 83. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Mostly clear, with a low around 58. West wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 87. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 60.
Independence Day
Mostly sunny, with a high near 88.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 61.
Monday
Sunny, with a high near 89.
Monday Night
Mostly clear, with a low around 62.
Tuesday
Sunny, with a high near 91.