S
M
T
W
T
F
S
26
85°
69°
27
94°
76°
28
84°
63°
29
83°
60°
30
84°
57°
31
76°
66°
1
74°
67°
2
81°
65°
3
83°
62°
4
85°
60°
5
85°
67°
6
79°
68°
7
87°
65°
8
88°
70°
9
89°
68°
10
90°
77°
11
93°
69°
12
88°
72°
13
86°
72°
14
87°
73°
15
91°
72°
16
87°
70°
17
80°
66°
18
81°
67°
19
84°
69°
20
86°
69°
21
81°
68°
22
84°
65°
23
81°
65°
24
83°
64°
25
79°
68°
26
83°
69°
27
85°
69°
28
86°
67°
29
80°
64°
30
76°
63°
31
76°
61°
1
77°
64°
2
78°
67°
3
79°
68°
4
84°
67°
5
80°
67°
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 76° to 93°, with overnight lows between 61° and 73°. The average high for August is 83° with an average low of 68°. 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.
