S
M
T
W
T
F
S
30
83°
67°
31
79°
67°
1
80°
66°
2
84°
63°
3
84°
58°
4
76°
59°
5
75°
66°
6
81°
62°
7
80°
58°
8
74°
60°
9
73°
62°
10
75°
65°
11
77°
64°
12
82°
65°
13
81°
64°
14
81°
59°
15
80°
56°
16
72°
58°
17
72°
54°
18
73°
54°
19
71°
51°
20
70°
50°
21
68°
52°
22
70°
59°
23
71°
52°
24
72°
58°
25
75°
59°
26
71°
60°
27
77°
59°
28
76°
56°
29
75°
53°
30
70°
53°
1
69°
54°
2
74°
56°
3
67°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Blue Island
Blue Island's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 47° and 67°. The average high for September is 75° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Blue Island. See also: October | November | December.
