S
M
T
W
T
F
S
30
87°
70°
31
89°
69°
1
86°
69°
2
83°
68°
3
83°
69°
4
84°
68°
5
83°
66°
6
82°
66°
7
83°
68°
8
82°
65°
9
81°
62°
10
82°
67°
11
81°
61°
12
85°
62°
13
86°
66°
14
86°
59°
15
80°
59°
16
78°
58°
17
79°
59°
18
83°
60°
19
84°
59°
20
84°
60°
21
83°
62°
22
84°
64°
23
80°
62°
24
81°
59°
25
81°
60°
26
83°
61°
27
82°
59°
28
82°
61°
29
83°
61°
30
82°
62°
1
82°
61°
2
81°
61°
3
81°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in DeKalb Highlands
DeKalb Highlands's September 2026 forecast shows daily high temperatures ranging from 78° to 89°, with overnight lows between 58° and 70°. The average high for September is 83° with an average low of 63°. 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 DeKalb Highlands. See also: October | November | December.
