S
M
T
W
T
F
S
26
90°
70°
27
85°
68°
28
84°
65°
29
79°
65°
30
81°
67°
31
81°
68°
1
82°
69°
2
88°
69°
3
88°
68°
4
87°
67°
5
86°
68°
6
90°
69°
7
88°
68°
8
88°
67°
9
85°
63°
10
79°
60°
11
80°
67°
12
80°
67°
13
86°
64°
14
79°
59°
15
79°
59°
16
80°
61°
17
79°
64°
18
79°
60°
19
82°
62°
20
84°
65°
21
84°
60°
22
80°
62°
23
85°
64°
24
87°
63°
25
88°
62°
26
88°
64°
27
87°
55°
28
80°
54°
29
76°
53°
30
77°
55°
31
78°
60°
1
83°
52°
2
78°
51°
3
74°
50°
4
73°
49°
5
74°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Marys
St. Marys's August 2026 forecast shows daily high temperatures ranging from 73° to 90°, with overnight lows between 49° and 70°. The average high for August is 82° with an average low of 62°. 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 St. Marys. See also: September | October | November.
