Ontario Airport (ONT) Weather 05/21/2025
Tonight
63
Mostly Clear
Wednesday
95
Sunny
Wednesday Night
62
Mostly Clear
Thursday
92
Sunny
Thursday Night
61
Mostly Clear
Friday
85
Sunny
Friday Night
58
Mostly Clear
Saturday
82
Sunny
Saturday Night
58
Mostly Clear
Sunday
85
Sunny
Sunday Night
60
Mostly Clear
Memorial Day
85
Patchy Fog then Sunny
Monday Night
60
Partly Cloudy
Weekly Forecast
Tonight
Mostly clear, with a low around 63. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Wednesday
Sunny, with a high near 95. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 62. West wind 10 to 15 mph becoming light northwest after midnight. Winds could gust as high as 25 mph.
Thursday
Sunny, with a high near 92. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
Mostly clear, with a low around 61. West wind 5 to 15 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 85.
Sunday Night
Mostly clear, with a low around 60.
Memorial Day
Patchy fog. Otherwise, mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 60.