10-day forecast for Ontario, IL: 27° to 72°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.
72°
Best day: Thursday, October 22
47° · 0.49 in
Worst day: Tuesday, October 27
Tap any day below to see morning, afternoon, evening and overnight.
Wed, 2171° / 45°0
Morning49°feels 47°
Afternoon70°feels 68°
Evening59°feels 58°
Overnight49°feels 47°
71 °
Ontario, Wednesday, 21 October
Mostly clear. High 71°, low 45°.
Pressure30.27 inHg
Wind4.8 mph SW
Humidity47%
Visibility6.2 mi
Dew point47°
Thu, 2272° / 50°0
Morning50°feels 49°
Afternoon71°feels 70°
Evening60°feels 60°
Overnight53°feels 52°
72 °
Ontario, Thursday, 22 October
Clear. High 72°, low 50°.
Pressure30.30 inHg
Wind2.8 mph E
Humidity54%
Visibility6.2 mi
Dew point52°
Fri, 2369° / 49°0
Morning52°feels 51°
Afternoon68°feels 67°
Evening59°feels 58°
Overnight53°feels 53°
69 °
Ontario, Friday, 23 October
Clear. High 69°, low 49°.
Pressure30.33 inHg
Wind7.4 mph SE
Humidity61%
Visibility6.2 mi
Dew point51°
Sat, 2467° / 50°0
Morning55°feels 53°
Afternoon64°feels 63°
Evening58°feels 56°
Overnight55°feels 53°
67 °
Ontario, Saturday, 24 October
Overcast. High 67°, low 50°.
Pressure30.33 inHg
Wind10.2 mph S
Humidity49%
Visibility—
Dew point44°
Sun, 2569° / 53°0.04
Morning58°feels 56°
Afternoon67°feels 67°
Evening60°feels 59°
Overnight57°feels 56°
69 °
Ontario, Sunday, 25 October
Light rain. High 69°, low 53°.
Pressure30.36 inHg
Wind8.3 mph S
Humidity55%
Visibility—
Dew point50°
Mon, 2656° / 50°0.07
Morning55°feels 52°
Afternoon55°feels 53°
Evening52°feels 51°
Overnight51°feels 49°
56 °
Ontario, Monday, 26 October
Light rain. High 56°, low 50°.
Pressure30.30 inHg
Wind8.2 mph NE
Humidity51%
Visibility—
Dew point37°
Tue, 2747° / 34°0.49
Morning42°feels 35°
Afternoon46°feels 38°
Evening37°feels 28°
Overnight35°feels 27°
47 °
Ontario, Tuesday, 27 October
Rain. High 47°, low 34°.
Pressure30.36 inHg
Wind17.5 mph NW
Humidity50%
Visibility—
Dew point29°
Wed, 2840° / 27°0
Morning30°feels 22°
Afternoon38°feels 31°
Evening33°feels 27°
Overnight31°feels 24°
40 °
Ontario, Wednesday, 28 October
Clear. High 40°, low 27°.
Pressure30.53 inHg
Wind11.2 mph NW
Humidity36%
Visibility—
Dew point13°
Thu, 2949° / 28°0
Morning33°feels 27°
Afternoon46°feels 41°
Evening40°feels 36°
Overnight36°feels 31°
49 °
Ontario, Thursday, 29 October
Clear. High 49°, low 28°.
Pressure30.27 inHg
Wind9.4 mph W
Humidity35%
Visibility—
Dew point18°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Ontario, IL around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.