S
M
T
W
T
F
S
26
87°
70°
27
86°
72°
28
82°
61°
29
82°
57°
30
83°
56°
31
74°
62°
1
73°
64°
2
77°
63°
3
81°
58°
4
83°
62°
5
81°
65°
6
80°
65°
7
84°
64°
8
80°
63°
9
82°
61°
10
86°
70°
11
79°
66°
12
82°
68°
13
75°
68°
14
79°
69°
15
82°
70°
16
82°
64°
17
78°
61°
18
79°
62°
19
80°
64°
20
79°
62°
21
80°
63°
22
79°
61°
23
79°
60°
24
75°
61°
25
79°
60°
26
82°
66°
27
84°
65°
28
75°
58°
29
76°
60°
30
80°
63°
31
83°
64°
1
83°
65°
2
84°
64°
3
83°
63°
4
82°
63°
5
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in DeKalb
DeKalb's August 2026 forecast shows daily high temperatures ranging from 75° to 84°, with overnight lows between 58° and 70°. The average high for August is 80° 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 August weather will actually feel in DeKalb. See also: September | October | November.
