S
M
T
W
T
F
S
26
99°
76°
27
99°
76°
28
98°
75°
29
98°
75°
30
96°
74°
31
98°
74°
1
96°
73°
2
95°
73°
3
94°
72°
4
96°
74°
5
96°
74°
6
95°
73°
7
97°
74°
8
97°
74°
9
96°
73°
10
96°
73°
11
95°
72°
12
94°
73°
13
95°
73°
14
96°
70°
15
96°
71°
16
95°
71°
17
96°
72°
18
95°
71°
19
93°
64°
20
89°
63°
21
87°
62°
22
87°
64°
23
89°
63°
24
91°
65°
25
93°
66°
26
94°
66°
27
95°
68°
28
96°
69°
29
95°
69°
30
95°
68°
31
94°
66°
1
93°
63°
2
92°
61°
3
85°
61°
4
87°
68°
5
90°
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 85° to 99°, with overnight lows between 61° and 76°. The average high for August is 94° with an average low of 70°. 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.
