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More than 200 million people to feel impacts of scorching July heat. Get details Chevron right

Illinois, IL

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September

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2025

2024 2025 2026

Daily
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T
F
S
31
84°
64°
1
84°
63°
2
83°
63°
3
84°
62°
4
85°
58°
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86°
53°
6
75°
54°
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75°
55°
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74°
61°
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78°
61°
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84°
60°
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84°
52°
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83°
49°
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74°
52°
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77°
57°
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78°
47°
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74°
46°
17
69°
46°
18
69°
52°
19
71°
57°
20
77°
52°
21
78°
46°
22
77°
48°
23
68°
46°
24
69°
51°
25
70°
53°
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68°
54°
27
76°
47°
28
77°
43°
29
68°
44°
30
67°
48°
1
67°
49°
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74°
51°
3
75°
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4
76°
50°

Temperature Graph

°F
90° 80° 70° 60° 50° Sep
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Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

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Weather Near Illinois:

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  • Joliet, IL
  • Naperville, IL
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