S
M
T
W
T
F
S
30
73°
48°
31
71°
48°
1
70°
47°
2
70°
50°
3
71°
50°
4
69°
52°
5
70°
50°
6
69°
49°
7
67°
48°
8
68°
46°
9
67°
46°
10
69°
52°
11
67°
46°
12
67°
45°
13
71°
45°
14
70°
51°
15
71°
52°
16
66°
45°
17
65°
43°
18
70°
43°
19
72°
50°
20
71°
51°
21
71°
49°
22
68°
47°
23
70°
43°
24
65°
42°
25
63°
47°
26
64°
40°
27
68°
41°
28
59°
40°
29
58°
40°
30
60°
44°
1
60°
38°
2
Hist. Avg.
63°
42°
3
Hist. Avg.
62°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Johnsbury
St. Johnsbury's September 2026 forecast shows daily high temperatures ranging from 58° to 73°, with overnight lows between 38° and 52°. The average high for September is 68° with an average low of 46°. 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. Johnsbury. See also: October | November | December.
