10-day forecast for Summit, IL: 34° to 70°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
70°
Best day: Sunday, October 25
61° · 0.31 in
Worst day: Tuesday, October 27
Tap any day below to see morning, afternoon, evening and overnight.
Tue, 2067° / 45°0
Morning47°feels 47°
Afternoon66°feels 65°
Evening56°feels 56°
Overnight48°feels 48°
67 °
Summit, Tuesday, 20 October
Clear. High 67°, low 45°.
Pressure30.39 inHg
Wind2.9 mph SE
Humidity58%
Visibility6.2 mi
Dew point47°
Wed, 2166° / 45°0
Morning46°feels 45°
Afternoon66°feels 65°
Evening57°feels 56°
Overnight48°feels 47°
66 °
Summit, Wednesday, 21 October
Clear. High 66°, low 45°.
Pressure30.30 inHg
Wind2.5 mph SW
Humidity59%
Visibility6.2 mi
Dew point49°
Thu, 2266° / 49°0.02
Morning51°feels 50°
Afternoon66°feels 66°
Evening56°feels 56°
Overnight52°feels 50°
66 °
Summit, Thursday, 22 October
Light rain. High 66°, low 49°.
Pressure30.33 inHg
Wind3.9 mph NE
Humidity71%
Visibility5.0 mi
Dew point56°
Fri, 2361° / 45°0
Morning47°feels 46°
Afternoon59°feels 58°
Evening54°feels 53°
Overnight51°feels 50°
61 °
Summit, Friday, 23 October
Clear. High 61°, low 45°.
Pressure30.36 inHg
Wind6.6 mph SE
Humidity64%
Visibility—
Dew point46°
Sat, 2462° / 45°0
Morning49°feels 47°
Afternoon59°feels 57°
Evening55°feels 54°
Overnight52°feels 49°
62 °
Summit, Saturday, 24 October
Overcast. High 62°, low 45°.
Pressure30.42 inHg
Wind6.5 mph S
Humidity59%
Visibility—
Dew point43°
Sun, 2570° / 53°0
Morning62°feels 60°
Afternoon69°feels 68°
Evening65°feels 64°
Overnight62°feels 60°
70 °
Summit, Sunday, 25 October
Overcast. High 70°, low 53°.
Pressure30.24 inHg
Wind9.4 mph W
Humidity44%
Visibility—
Dew point46°
Mon, 2665° / 57°0.06
Morning59°feels 56°
Afternoon64°feels 62°
Evening59°feels 58°
Overnight60°feels 58°
65 °
Summit, Monday, 26 October
Light rain. High 65°, low 57°.
Pressure30.24 inHg
Wind7.7 mph S
Humidity25%
Visibility—
Dew point27°
Tue, 2761° / 41°0.31
Morning58°feels 57°
Afternoon55°feels 53°
Evening47°feels 42°
Overnight45°feels 40°
61 °
Summit, Tuesday, 27 October
Light rain. High 61°, low 41°.
Pressure29.91 inHg
Wind10.8 mph NW
Humidity81%
Visibility—
Dew point51°
Wed, 2842° / 34°0.07
Morning36°feels 29°
Afternoon41°feels 34°
Evening40°feels 35°
Overnight38°feels 33°
42 °
Summit, Wednesday, 28 October
Snow. High 42°, low 34°.
Pressure30.27 inHg
Wind11.3 mph NW
Humidity30%
Visibility—
Dew point11°
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.