S
M
T
W
T
F
S
26
100°
80°
27
99°
80°
28
100°
79°
29
100°
79°
30
101°
80°
31
101°
80°
1
100°
79°
2
100°
79°
3
99°
78°
4
99°
79°
5
98°
79°
6
99°
78°
7
99°
80°
8
100°
80°
9
100°
79°
10
98°
79°
11
98°
78°
12
97°
78°
13
97°
76°
14
96°
76°
15
96°
75°
16
98°
76°
17
97°
75°
18
96°
73°
19
98°
74°
20
96°
71°
21
92°
70°
22
90°
69°
23
91°
71°
24
95°
72°
25
97°
71°
26
96°
70°
27
97°
72°
28
97°
74°
29
96°
72°
30
96°
73°
31
95°
70°
1
95°
70°
2
94°
68°
3
95°
70°
4
95°
73°
5
96°
72°
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 90° to 101°, with overnight lows between 68° and 80°. The average high for August is 97° with an average low of 75°. 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.
