S
M
T
W
T
F
S
26
80°
60°
27
85°
65°
28
81°
63°
29
78°
58°
30
82°
59°
31
87°
62°
1
80°
67°
2
81°
66°
3
77°
58°
4
82°
53°
5
85°
61°
6
85°
64°
7
84°
68°
8
86°
65°
9
84°
61°
10
83°
68°
11
76°
63°
12
74°
63°
13
81°
62°
14
80°
68°
15
81°
66°
16
83°
70°
17
80°
64°
18
79°
59°
19
81°
64°
20
79°
62°
21
81°
59°
22
81°
63°
23
73°
57°
24
73°
52°
25
77°
53°
26
80°
56°
27
82°
62°
28
78°
59°
29
81°
55°
30
84°
69°
31
87°
69°
1
90°
69°
2
91°
71°
3
90°
65°
4
86°
64°
5
81°
60°
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 81° to 91°, with overnight lows between 60° and 71°. The average high for August is 87° with an average low of 67°. 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.
