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