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