10-day forecast for Ontario, IL: 33° to 71°, with precipitation expected on 1 day. The table below breaks each day into morning, afternoon, evening and overnight.
71°
Best day: Thursday, October 22
63° · 0.33 in
Worst day: Tuesday, October 27
Tap any day below to see morning, afternoon, evening and overnight.
Tue, 2069° / 43°0
Morning46°feels 44°
Afternoon68°feels 67°
Evening55°feels 53°
Overnight47°feels 46°
69 °
Ontario, Tuesday, 20 October
Clear. High 69°, low 43°.
Pressure30.36 inHg
Wind5.5 mph SE
Humidity42%
Visibility6.2 mi
Dew point42°
Wed, 2170° / 47°0
Morning48°feels 47°
Afternoon70°feels 69°
Evening60°feels 59°
Overnight49°feels 47°
70 °
Ontario, Wednesday, 21 October
Clear. High 70°, low 47°.
Pressure30.27 inHg
Wind4.4 mph SW
Humidity48%
Visibility6.2 mi
Dew point48°
Thu, 2271° / 50°0
Morning51°feels 50°
Afternoon70°feels 69°
Evening59°feels 58°
Overnight53°feels 52°
71 °
Ontario, Thursday, 22 October
Clear. High 71°, low 50°.
Pressure30.30 inHg
Wind2.6 mph E
Humidity54%
Visibility6.2 mi
Dew point52°
Fri, 2368° / 51°0
Morning56°feels 55°
Afternoon67°feels 66°
Evening59°feels 58°
Overnight53°feels 52°
68 °
Ontario, Friday, 23 October
Clear. High 68°, low 51°.
Pressure30.30 inHg
Wind8.4 mph S
Humidity52%
Visibility—
Dew point47°
Sat, 2468° / 51°0
Morning55°feels 53°
Afternoon65°feels 64°
Evening60°feels 58°
Overnight58°feels 57°
68 °
Ontario, Saturday, 24 October
Overcast. High 68°, low 51°.
Pressure30.39 inHg
Wind10.3 mph S
Humidity48%
Visibility—
Dew point44°
Sun, 2567° / 55°0
Morning63°feels 62°
Afternoon65°feels 64°
Evening57°feels 56°
Overnight56°feels 54°
67 °
Ontario, Sunday, 25 October
Overcast. High 67°, low 55°.
Pressure30.24 inHg
Wind14.4 mph S
Humidity57%
Visibility—
Dew point50°
Mon, 2670° / 49°0
Morning55°feels 53°
Afternoon67°feels 66°
Evening63°feels 62°
Overnight62°feels 61°
70 °
Ontario, Monday, 26 October
Overcast. High 70°, low 49°.
Pressure30.15 inHg
Wind11.2 mph S
Humidity55%
Visibility—
Dew point49°
Tue, 2763° / 44°0.33
Morning50°feels 48°
Afternoon46°feels 40°
Evening44°feels 39°
Overnight46°feels 42°
63 °
Ontario, Tuesday, 27 October
Rain. High 63°, low 44°.
Pressure30.18 inHg
Wind13.1 mph N
Humidity83%
Visibility—
Dew point42°
Wed, 2843° / 33°0
Morning37°feels 28°
Afternoon41°feels 34°
Evening35°feels 29°
Overnight33°feels 27°
43 °
Ontario, Wednesday, 28 October
Clear. High 43°, low 33°.
Pressure30.45 inHg
Wind14.8 mph N
Humidity39%
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.