S
M
T
W
T
F
S
26
87°
72°
27
88°
72°
28
89°
71°
29
89°
71°
30
88°
70°
31
85°
70°
1
86°
71°
2
88°
72°
3
89°
72°
4
89°
71°
5
88°
72°
6
88°
72°
7
85°
65°
8
86°
68°
9
85°
62°
10
82°
64°
11
81°
63°
12
82°
65°
13
81°
66°
14
80°
65°
15
80°
68°
16
84°
68°
17
83°
64°
18
81°
64°
19
80°
63°
20
80°
63°
21
81°
62°
22
82°
63°
23
84°
68°
24
87°
69°
25
88°
68°
26
88°
68°
27
87°
60°
28
85°
61°
29
80°
62°
30
79°
60°
31
78°
59°
1
79°
58°
2
78°
58°
3
77°
57°
4
77°
57°
5
78°
62°
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 77° to 89°, with overnight lows between 57° and 72°. The average high for August is 84° with an average low of 66°. 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.
