10-day forecast for Summit, 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: Wednesday, October 21
42°
Worst day: Wednesday, October 28
Tap any day below to see morning, afternoon, evening and overnight.
Wed, 2171° / 43°0
Morning48°feels 47°
Afternoon70°feels 69°
Evening55°feels 54°
Overnight48°feels 47°
71 °
Summit, Wednesday, 21 October
Clear. High 71°, low 43°.
Pressure30.27 inHg
Wind2.7 mph SW
Humidity57%
Visibility6.2 mi
Dew point48°
Thu, 2269° / 49°0
Morning51°feels 50°
Afternoon69°feels 68°
Evening58°feels 58°
Overnight52°feels 51°
69 °
Summit, Thursday, 22 October
Clear. High 69°, low 49°.
Pressure30.30 inHg
Wind2.1 mph NE
Humidity69%
Visibility6.2 mi
Dew point56°
Fri, 2365° / 49°0
Morning49°feels 47°
Afternoon64°feels 64°
Evening56°feels 56°
Overnight53°feels 53°
65 °
Summit, Friday, 23 October
Clear. High 65°, low 49°.
Pressure30.36 inHg
Wind3.9 mph SE
Humidity70%
Visibility6.2 mi
Dew point52°
Sat, 2465° / 47°0
Morning49°feels 47°
Afternoon63°feels 62°
Evening58°feels 56°
Overnight49°feels 47°
65 °
Summit, Saturday, 24 October
Mostly clear. High 65°, low 47°.
Pressure30.39 inHg
Wind6.6 mph S
Humidity57%
Visibility—
Dew point46°
Sun, 2570° / 53°0
Morning57°feels 56°
Afternoon67°feels 66°
Evening64°feels 63°
Overnight60°feels 60°
70 °
Summit, Sunday, 25 October
Overcast. High 70°, low 53°.
Pressure30.36 inHg
Wind6.9 mph S
Humidity59%
Visibility—
Dew point50°
Mon, 2671° / 52°0.11
Morning63°feels 61°
Afternoon70°feels 69°
Evening62°feels 61°
Overnight53°feels 52°
71 °
Summit, Monday, 26 October
Light rain. High 71°, low 52°.
Pressure30.09 inHg
Wind11.4 mph SW
Humidity35%
Visibility—
Dew point41°
Tue, 2752° / 40°0.01
Morning46°feels 42°
Afternoon51°feels 47°
Evening44°feels 38°
Overnight41°feels 34°
52 °
Summit, Tuesday, 27 October
Light rain. High 52°, low 40°.
Pressure30.33 inHg
Wind12.6 mph NW
Humidity32%
Visibility—
Dew point22°
Wed, 2842° / 33°0
Morning36°feels 29°
Afternoon41°feels 36°
Evening40°feels 35°
Overnight38°feels 32°
42 °
Summit, Wednesday, 28 October
Clear. High 42°, low 33°.
Pressure30.47 inHg
Wind10.2 mph NW
Humidity22%
Visibility—
Dew point4°
Thu, 2952° / 35°0
Morning39°feels 33°
Afternoon49°feels 44°
Evening48°feels 44°
Overnight46°feels 41°
52 °
Summit, Thursday, 29 October
Clear. High 52°, low 35°.
Pressure30.12 inHg
Wind12.8 mph SW
Humidity30%
Visibility—
Dew point17°
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.