S
M
T
W
T
F
S
26
97°
77°
27
91°
79°
28
93°
77°
29
96°
78°
30
90°
77°
31
91°
75°
1
90°
76°
2
88°
75°
3
83°
75°
4
86°
74°
5
88°
76°
6
87°
77°
7
85°
74°
8
86°
75°
9
87°
76°
10
90°
74°
11
93°
75°
12
92°
74°
13
91°
75°
14
90°
76°
15
85°
75°
16
86°
74°
17
87°
76°
18
89°
75°
19
91°
77°
20
92°
78°
21
91°
77°
22
87°
77°
23
87°
76°
24
88°
76°
25
90°
77°
26
90°
77°
27
89°
76°
28
89°
77°
29
86°
76°
30
90°
77°
31
90°
77°
1
89°
76°
2
89°
77°
3
88°
77°
4
85°
74°
5
84°
76°
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 83° to 93°, with overnight lows between 74° and 78°. The average high for August is 88° with an average low of 76°. 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.
