S
M
T
W
T
F
S
26
91°
74°
27
90°
73°
28
95°
72°
29
90°
74°
30
88°
66°
31
90°
62°
1
91°
72°
2
80°
66°
3
83°
69°
4
88°
67°
5
87°
70°
6
89°
71°
7
91°
70°
8
89°
70°
9
91°
70°
10
90°
69°
11
93°
72°
12
90°
74°
13
94°
73°
14
94°
75°
15
95°
74°
16
97°
70°
17
99°
73°
18
89°
68°
19
92°
65°
20
95°
71°
21
90°
69°
22
93°
68°
23
91°
67°
24
88°
70°
25
86°
71°
26
87°
72°
27
85°
71°
28
89°
70°
29
88°
69°
30
88°
69°
31
88°
69°
1
87°
68°
2
90°
71°
3
87°
65°
4
90°
70°
5
89°
70°
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 85° to 93°, with overnight lows between 65° and 72°. The average high for August is 89° 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.
