S
M
T
W
T
F
S
26
81°
57°
27
82°
58°
28
75°
61°
29
65°
60°
30
76°
60°
31
82°
62°
1
83°
59°
2
80°
66°
3
76°
55°
4
83°
58°
5
80°
64°
6
84°
66°
7
84°
62°
8
83°
62°
9
84°
59°
10
78°
58°
11
76°
58°
12
76°
55°
13
77°
58°
14
76°
57°
15
75°
56°
16
73°
52°
17
81°
56°
18
74°
54°
19
73°
59°
20
74°
54°
21
73°
51°
22
74°
56°
23
79°
60°
24
79°
59°
25
76°
59°
26
77°
58°
27
75°
58°
28
73°
57°
29
77°
57°
30
76°
58°
31
78°
55°
1
76°
51°
2
70°
48°
3
70°
48°
4
71°
49°
5
71°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Johnsville
St. Johnsville's August 2026 forecast shows daily high temperatures ranging from 70° to 84°, with overnight lows between 48° and 66°. The average high for August is 77° with an average low of 57°. 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. Johnsville. See also: September | October | November.
