S
M
T
W
T
F
S
26
70°
50°
27
78°
60°
28
74°
46°
29
66°
45°
30
65°
44°
1
53°
39°
2
57°
40°
3
61°
43°
4
63°
46°
5
65°
49°
6
64°
46°
7
63°
44°
8
63°
43°
9
64°
46°
10
64°
43°
11
63°
49°
12
66°
55°
13
73°
54°
14
68°
51°
15
65°
47°
16
65°
46°
17
66°
46°
18
65°
48°
19
66°
47°
20
66°
48°
21
67°
47°
22
68°
53°
23
71°
56°
24
74°
53°
25
69°
49°
26
69°
49°
27
70°
53°
28
71°
58°
29
71°
59°
30
72°
59°
31
70°
58°
1
71°
59°
2
72°
57°
3
75°
58°
4
80°
60°
5
82°
56°
6
75°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. Marys
St. Marys's May 2026 forecast shows daily high temperatures ranging from 53° to 82°, with overnight lows between 39° and 61°. The average high for May is 68° with an average low of 50°. 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 St. Marys. See also: June | July | August.
