S
M
T
W
T
F
S
26
74°
56°
27
79°
55°
28
76°
61°
29
68°
59°
30
74°
53°
31
80°
49°
1
77°
55°
2
71°
66°
3
74°
51°
4
80°
45°
5
82°
55°
6
80°
62°
7
78°
60°
8
78°
64°
9
79°
58°
10
74°
59°
11
76°
64°
12
74°
59°
13
76°
59°
14
79°
54°
15
81°
63°
16
75°
69°
17
79°
59°
18
79°
57°
19
76°
59°
20
73°
49°
21
71°
53°
22
70°
52°
23
75°
53°
24
77°
54°
25
77°
56°
26
76°
57°
27
75°
54°
28
73°
53°
29
72°
50°
30
75°
54°
31
71°
48°
1
71°
50°
2
72°
53°
3
70°
55°
4
69°
52°
5
70°
50°
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 69° to 81°, with overnight lows between 48° and 69°. The average high for August is 74° 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.
