S
M
T
W
T
F
S
26
81°
62°
27
84°
64°
28
83°
68°
29
80°
61°
30
83°
55°
31
85°
57°
1
81°
71°
2
82°
68°
3
81°
61°
4
84°
67°
5
84°
68°
6
84°
68°
7
85°
69°
8
85°
68°
9
84°
69°
10
85°
67°
11
82°
65°
12
81°
64°
13
83°
60°
14
82°
61°
15
79°
59°
16
78°
59°
17
87°
67°
18
87°
66°
19
86°
66°
20
87°
65°
21
84°
64°
22
86°
66°
23
87°
66°
24
87°
65°
25
86°
66°
26
85°
66°
27
85°
65°
28
83°
65°
29
82°
63°
30
84°
64°
31
84°
64°
1
85°
63°
2
80°
57°
3
78°
57°
4
78°
58°
5
80°
57°
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 78° to 87°, with overnight lows between 57° and 71°. The average high for August is 83° with an average low of 64°. 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.
