Ontario Airport (ONT) Weather 12/15/2025
Tonight
46
Cloudy
Wednesday
67
Gradual Clearing
Wednesday Night
45
Mostly Clear
Thursday
69
Sunny
Thursday Night
44
Mostly Clear
Friday
71
Sunny
Friday Night
46
Clear
Saturday
71
Sunny
Saturday Night
47
Clear
Sunday
73
Sunny
Sunday Night
49
Mostly Clear
Monday
77
Sunny
Monday Night
52
Mostly Clear
Weekly Forecast
Tonight
Cloudy, with a low around 46. Southwest wind 5 to 10 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 67. Light and variable wind becoming northeast 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 45. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 69. Light north wind becoming northeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Mostly clear, with a low around 44. Southeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 71.
Friday Night
Clear, with a low around 46.
Saturday
Sunny, with a high near 71.
Saturday Night
Clear, with a low around 47.
Sunday
Sunny, with a high near 73.
Sunday Night
Mostly clear, with a low around 49.
Monday
Sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 52.