S
M
T
W
T
F
S
30
76°
58°
31
78°
55°
1
76°
51°
2
70°
48°
3
70°
48°
4
71°
49°
5
71°
48°
6
74°
56°
7
78°
55°
8
77°
56°
9
76°
55°
10
77°
55°
11
76°
54°
12
78°
55°
13
79°
56°
14
79°
44°
15
68°
47°
16
67°
44°
17
69°
47°
18
71°
44°
19
67°
45°
20
67°
44°
21
74°
49°
22
75°
50°
23
75°
41°
24
69°
39°
25
67°
41°
26
70°
47°
27
72°
49°
28
72°
46°
29
68°
38°
30
62°
39°
1
62°
43°
2
66°
42°
3
69°
46°
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 62° to 79°, with overnight lows between 38° and 58°. The average high for September is 72° with an average low of 48°. 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.
