S
M
T
W
T
F
S
30
76°
58°
31
79°
61°
1
76°
57°
2
81°
52°
3
75°
51°
4
73°
51°
5
73°
52°
6
74°
56°
7
81°
60°
8
83°
61°
9
82°
53°
10
75°
54°
11
75°
59°
12
76°
55°
13
81°
50°
14
73°
49°
15
71°
48°
16
72°
52°
17
76°
55°
18
79°
46°
19
71°
55°
20
73°
49°
21
74°
55°
22
72°
56°
23
79°
56°
24
78°
55°
25
78°
56°
26
77°
55°
27
78°
55°
28
78°
54°
29
76°
54°
30
76°
55°
1
78°
49°
2
77°
43°
3
75°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Long Grove
Long Grove's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 43° and 61°. The average high for September is 76° with an average low of 53°. 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 Long Grove. See also: October | November | December.
