S
M
T
W
T
F
S
26
87°
71°
27
88°
68°
28
87°
68°
29
89°
69°
30
88°
68°
31
86°
70°
1
87°
71°
2
87°
71°
3
90°
72°
4
89°
71°
5
88°
70°
6
88°
70°
7
89°
68°
8
91°
68°
9
91°
69°
10
88°
70°
11
90°
70°
12
89°
72°
13
87°
71°
14
86°
71°
15
86°
70°
16
87°
71°
17
91°
71°
18
91°
70°
19
86°
70°
20
86°
67°
21
87°
68°
22
90°
70°
23
88°
68°
24
86°
69°
25
87°
66°
26
86°
68°
27
89°
70°
28
90°
65°
29
85°
65°
30
84°
66°
31
84°
65°
1
85°
65°
2
87°
66°
3
87°
66°
4
86°
67°
5
85°
68°
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 84° to 91°, with overnight lows between 65° and 72°. The average high for August is 88° with an average low of 69°. 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.
