10-day forecast for Summit, IL: 39° to 85°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.
85°
Best day: Monday, October 12
60° · 1.64 in
Worst day: Thursday, October 15
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1285° / 64°0
Morning67°feels 67°
Afternoon83°feels 86°
Evening78°feels 79°
Overnight65°feels 65°
85 °
Summit, Monday, 12 October
Clear. High 85°, low 64°.
Pressure29.85 inHg
Wind9.7 mph SW
Humidity63%
Visibility6.2 mi
Dew point64°
Tue, 1380° / 66°0
Morning70°feels 71°
Afternoon80°feels 82°
Evening71°feels 72°
Overnight77°feels 78°
80 °
Summit, Tuesday, 13 October
Clear. High 80°, low 66°.
Pressure29.80 inHg
Wind9.1 mph W
Humidity68%
Visibility6.2 mi
Dew point67°
Wed, 1467° / 60°0.5
Morning63°feels 64°
Afternoon67°feels 67°
Evening60°feels 60°
Overnight65°feels 66°
67 °
Summit, Wednesday, 14 October
Heavy rain. High 67°, low 60°.
Pressure30.09 inHg
Wind6 mph NE
Humidity79%
Visibility6.2 mi
Dew point61°
Thu, 1560° / 57°1.64
Morning58°feels 57°
Afternoon60°feels 60°
Evening60°feels 60°
Overnight58°feels 58°
60 °
Summit, Thursday, 15 October
Heavy rain. High 60°, low 57°.
Pressure30.03 inHg
Wind6.1 mph E
Humidity97%
Visibility1.0 mi
Dew point58°
Fri, 1658° / 47°0
Morning53°feels 51°
Afternoon56°feels 54°
Evening50°feels 48°
Overnight48°feels 46°
58 °
Summit, Friday, 16 October
Mostly clear. High 58°, low 47°.
Pressure30.39 inHg
Wind15.5 mph N
Humidity50%
Visibility—
Dew point38°
Sat, 1750° / 39°0
Morning42°feels 40°
Afternoon49°feels 47°
Evening47°feels 44°
Overnight43°feels 42°
50 °
Summit, Saturday, 17 October
Clear. High 50°, low 39°.
Pressure30.59 inHg
Wind5.3 mph NW
Humidity28%
Visibility—
Dew point16°
Sun, 1858° / 39°0
Morning44°feels 38°
Afternoon55°feels 51°
Evening53°feels 50°
Overnight49°feels 45°
58 °
Summit, Sunday, 18 October
Clear. High 58°, low 39°.
Pressure30.45 inHg
Wind14.5 mph SW
Humidity32%
Visibility—
Dew point24°
Mon, 1965° / 47°0
Morning51°feels 47°
Afternoon62°feels 59°
Evening58°feels 56°
Overnight54°feels 51°
65 °
Summit, Monday, 19 October
Clear. High 65°, low 47°.
Pressure30.36 inHg
Wind11 mph SW
Humidity26%
Visibility—
Dew point25°
Tue, 2065° / 53°0
Morning56°feels 53°
Afternoon62°feels 60°
Evening61°feels 59°
Overnight58°feels 56°
65 °
Summit, Tuesday, 20 October
Overcast. High 65°, low 53°.
Pressure30.36 inHg
Wind7.5 mph S
Humidity29%
Visibility—
Dew point29°
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 Summit, 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.