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°
56°
21
82°
63°
22
76°
56°
23
75°
50°
24
75°
47°
25
79°
60°
26
78°
57°
27
77°
54°
28
75°
53°
29
74°
54°
30
74°
55°
31
75°
53°
1
76°
53°
2
75°
55°
3
76°
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 47° and 63°. The average high for August is 76° with an average low of 55°. 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.
