S
M
T
W
T
F
S
26
69°
48°
27
80°
44°
28
77°
53°
29
67°
49°
30
56°
39°
1
59°
34°
2
54°
33°
3
61°
30°
4
72°
47°
5
76°
59°
6
61°
50°
7
63°
40°
8
71°
36°
9
70°
52°
10
70°
52°
11
69°
46°
12
73°
42°
13
72°
49°
14
60°
41°
15
70°
35°
16
73°
47°
17
86°
62°
18
89°
58°
19
90°
65°
20
75°
50°
21
71°
59°
22
69°
63°
23
76°
65°
24
77°
64°
25
78°
63°
26
79°
66°
27
78°
61°
28
82°
65°
29
80°
61°
30
83°
63°
31
84°
64°
1
78°
57°
2
77°
62°
3
79°
61°
4
74°
59°
5
74°
57°
6
76°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Marietta
Marietta's May 2026 forecast shows daily high temperatures ranging from 69° to 90°, with overnight lows between 50° and 66°. The average high for May is 78° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Marietta. See also: June | July | August.
