S
M
T
W
T
F
S
26
81°
59°
27
82°
59°
28
81°
60°
29
82°
61°
30
83°
60°
31
81°
60°
1
76°
59°
2
75°
56°
3
75°
53°
4
76°
59°
5
74°
58°
6
75°
54°
7
77°
56°
8
80°
58°
9
81°
59°
10
81°
59°
11
80°
58°
12
80°
58°
13
81°
59°
14
82°
57°
15
83°
59°
16
80°
59°
17
76°
58°
18
81°
59°
19
80°
55°
20
77°
50°
21
75°
49°
22
73°
50°
23
74°
52°
24
75°
51°
25
74°
49°
26
74°
56°
27
73°
51°
28
75°
49°
29
73°
50°
30
72°
48°
31
71°
48°
1
71°
49°
2
72°
52°
3
70°
52°
4
72°
49°
5
73°
47°
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 70° to 83°, with overnight lows between 47° and 61°. The average high for August is 77° with an average low of 55°. 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.
