S
M
T
W
T
F
S
30
75°
56°
31
73°
56°
1
68°
63°
2
67°
60°
3
78°
61°
4
78°
59°
5
72°
58°
6
70°
53°
7
75°
49°
8
76°
51°
9
71°
56°
10
75°
59°
11
70°
49°
12
73°
45°
13
75°
60°
14
66°
50°
15
65°
42°
16
72°
53°
17
67°
62°
18
73°
54°
19
64°
52°
20
59°
45°
21
65°
41°
22
61°
42°
23
62°
44°
24
65°
42°
25
67°
43°
26
68°
47°
27
68°
46°
28
67°
46°
29
69°
45°
30
71°
48°
1
67°
46°
2
69°
44°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Johnsville
St. Johnsville's September 2026 forecast shows daily high temperatures ranging from 59° to 71°, with overnight lows between 41° and 52°. The average high for September is 66° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in St. Johnsville. See also: October | November | December.
