S
M
T
W
T
F
S
26
72°
53°
27
72°
48°
28
56°
44°
29
60°
44°
30
56°
42°
1
58°
39°
2
63°
37°
3
76°
51°
4
82°
49°
5
59°
44°
6
58°
40°
7
70°
40°
8
76°
46°
9
74°
47°
10
72°
41°
11
75°
45°
12
78°
55°
13
76°
50°
14
80°
52°
15
88°
59°
16
82°
60°
17
82°
62°
18
79°
62°
19
66°
48°
20
62°
43°
21
64°
51°
22
68°
55°
23
73°
52°
24
82°
59°
25
85°
60°
26
85°
64°
27
81°
62°
28
80°
59°
29
76°
56°
30
77°
58°
31
78°
55°
1
81°
57°
2
79°
59°
3
79°
60°
4
81°
59°
5
78°
58°
6
78°
62°
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 73° to 85°, with overnight lows between 52° and 64°. The average high for May is 80° with an average low of 59°. 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.
