S
M
T
W
T
F
S
26
81°
71°
27
82°
71°
28
81°
70°
29
81°
71°
30
82°
70°
31
84°
66°
1
81°
66°
2
81°
71°
3
82°
71°
4
82°
70°
5
84°
71°
6
85°
71°
7
85°
70°
8
83°
71°
9
85°
70°
10
83°
67°
11
85°
71°
12
87°
70°
13
82°
69°
14
84°
68°
15
86°
70°
16
86°
69°
17
85°
69°
18
84°
68°
19
84°
64°
20
82°
65°
21
81°
64°
22
81°
64°
23
82°
65°
24
81°
64°
25
81°
63°
26
82°
63°
27
81°
64°
28
82°
64°
29
85°
65°
30
85°
64°
31
86°
65°
1
85°
65°
2
84°
67°
3
85°
63°
4
80°
62°
5
81°
62°
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 80° to 87°, with overnight lows between 62° and 71°. The average high for August is 83° with an average low of 67°. 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.
