S
M
T
W
T
F
S
26
82°
64°
27
85°
65°
28
85°
64°
29
84°
63°
30
83°
62°
31
78°
59°
1
79°
62°
2
84°
64°
3
86°
65°
4
86°
64°
5
87°
65°
6
84°
64°
7
82°
62°
8
83°
60°
9
82°
55°
10
79°
54°
11
77°
58°
12
78°
54°
13
77°
55°
14
78°
55°
15
76°
57°
16
77°
59°
17
82°
58°
18
78°
56°
19
77°
54°
20
78°
60°
21
79°
60°
22
80°
58°
23
81°
61°
24
82°
60°
25
83°
60°
26
83°
59°
27
82°
52°
28
82°
52°
29
75°
57°
30
76°
52°
31
75°
51°
1
76°
52°
2
74°
50°
3
73°
49°
4
74°
50°
5
75°
54°
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 73° to 87°, with overnight lows between 49° and 65°. The average high for August is 80° with an average low of 58°. 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.
