Ontario Airport (ONT) Weather 06/23/2026
Today
86
Sunny
Tonight
60
Mostly Clear then Patchy Fog
Thursday
82
Patchy Fog then Sunny
Thursday Night
59
Increasing Clouds
Juneteenth
82
Patchy Fog then Sunny
Friday Night
57
Mostly Clear
Saturday
81
Patchy Fog then Sunny
Saturday Night
57
Clear
Sunday
82
Sunny
Sunday Night
58
Clear
Monday
87
Sunny
Monday Night
60
Clear
Tuesday
91
Sunny
Weekly Forecast
Today
Sunny, with a high near 86. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 60. West wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
Patchy fog before 11am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 82. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Increasing clouds, with a low around 59. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Juneteenth
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 57.
Saturday
Patchy fog before 11am. Otherwise, sunny, with a high near 81.
Saturday Night
Clear, with a low around 57.
Sunday
Sunny, with a high near 82.
Sunday Night
Clear, with a low around 58.
Monday
Sunny, with a high near 87.
Monday Night
Clear, with a low around 60.
Tuesday
Sunny, with a high near 91.