S
M
T
W
T
F
S
26
92°
73°
27
92°
76°
28
95°
77°
29
89°
74°
30
88°
70°
31
90°
65°
1
89°
73°
2
91°
73°
3
86°
68°
4
84°
71°
5
84°
71°
6
86°
71°
7
86°
70°
8
88°
69°
9
87°
71°
10
85°
71°
11
84°
72°
12
86°
70°
13
85°
71°
14
86°
70°
15
85°
70°
16
85°
71°
17
83°
68°
18
87°
70°
19
88°
72°
20
88°
71°
21
87°
71°
22
86°
70°
23
86°
71°
24
87°
71°
25
86°
70°
26
87°
70°
27
86°
69°
28
86°
70°
29
85°
70°
30
86°
69°
31
86°
69°
1
85°
68°
2
87°
69°
3
86°
69°
4
84°
67°
5
83°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Marietta
Marietta's August 2026 forecast shows daily high temperatures ranging from 83° to 88°, with overnight lows between 66° and 72°. The average high for August is 86° 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 Marietta. See also: September | October | November.
