Ontario Airport (ONT) Weather 08/31/2025
Tonight
74
Mostly Clear
Friday
103
Sunny
Friday Night
74
Mostly Clear
Saturday
101
Chance T-storms then Sunny
Saturday Night
74
Mostly Clear
Sunday
100
Sunny
Sunday Night
72
Mostly Clear
Monday
97
Mostly Sunny
Monday Night
69
Mostly Clear
Tuesday
93
Sunny
Tuesday Night
67
Mostly Clear
Wednesday
92
Sunny
Wednesday Night
65
Mostly Clear
Weekly Forecast
Tonight
Mostly clear, with a low around 74. West wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 103. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 74. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Saturday
A chance of showers and thunderstorms before 11am. Mostly 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. Chance of precipitation is 30%.
Saturday Night
Mostly clear, with a low around 74. Southwest wind 5 to 10 mph becoming light west after midnight.
Sunday
Sunny, with a high near 100.
Sunday Night
Mostly clear, with a low around 72.
Monday
Mostly sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 65.