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Summit, IL

81°F
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Summit, IL Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Today Hourly 10-Day Radar MinuteCast®

Monthly

Air Quality Health & Activities
2
Air Quality Alert

July

January February March April May June July August September October November December

2026

2025 2026 2027

10-Day

S
M
T
W
T
F
S
28
Humid with a shower in spots
88°
71°
29
Partly sunny and humid
88°
70°
30
Humid; a few morning showers
87°
71°
1
A couple of morning showers
86°
71°
2
Mostly cloudy and less humid
86°
67°
3
A shower in the afternoon
79°
65°
4
Mostly sunny
80°
64°
5
Increasing cloudiness
81°
70°
6
A shower and thunderstorm
85°
72°
7
Windy and humid with t-storms
84°
72°
8
A shower and thunderstorm
85°
71°
9
Humid with some sun
87°
71°
10
Mostly sunny
82°
67°
11
Sunshine and a few clouds
82°
69°
12
A couple of afternoon showers
83°
72°
13
A shower and t-storm; humid
88°
71°
14
Humid; a p.m. t-storm or two
89°
65°
15
Partly sunny and less humid
82°
71°
16
Mostly sunny and humid
85°
70°
17
Cloudy, thunderstorms; humid
83°
67°
18
Humid with clouds and sun
83°
65°
19
A shower and thunderstorm
82°
64°
20
Partly sunny
82°
66°
21
Humid with plenty of sunshine
84°
72°
22
Mostly sunny and humid
85°
66°
23
A shower and t-storm; humid
84°
65°
24
Clouds and sun with a shower
81°
65°
25
An afternoon t-storm or two
82°
71°
26
Humid; a p.m. t-storm or two
82°
73°
27
Humid with thunderstorms
83°
72°
28
A t-storm around in the p.m.
86°
67°
29
Humid with a t-storm or two
82°
64°
30
Thunderstorms, mainly early
81°
63°
31
Sunny and less humid
81°
63°
1
Plenty of sunshine
82°
64°

Temperature Graph

°F
90° 84° 78° 72° 66° Jul
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

July Weather in Summit

Summit's July 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 63° and 73°. The average high for July is 84° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Summit. See also: August | September | October.

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World North America United States Illinois Summit

Weather Near Summit:

  • Chicago, IL
  • Joliet, IL
  • Naperville, IL
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