S
M
T
W
T
F
S
26
85°
72°
27
84°
70°
28
76°
64°
29
77°
57°
30
81°
58°
31
83°
59°
1
75°
69°
2
78°
62°
3
79°
57°
4
85°
60°
5
85°
70°
6
81°
68°
7
84°
68°
8
78°
61°
9
81°
57°
10
82°
70°
11
80°
68°
12
79°
65°
13
79°
66°
14
86°
68°
15
79°
71°
16
82°
73°
17
77°
62°
18
80°
59°
19
83°
59°
20
82°
59°
21
80°
64°
22
78°
57°
23
75°
50°
24
75°
54°
25
77°
56°
26
75°
54°
27
77°
52°
28
78°
56°
29
79°
55°
30
81°
57°
31
82°
58°
1
81°
59°
2
82°
54°
3
72°
54°
4
72°
57°
5
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Decatur
Decatur's August 2026 forecast shows daily high temperatures ranging from 72° to 82°, with overnight lows between 50° and 64°. The average high for August is 78° with an average low of 56°. 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 Decatur. See also: September | October | November.
