S
M
T
W
T
F
S
30
80°
44°
31
77°
50°
1
76°
45°
2
73°
44°
3
62°
49°
4
76°
60°
5
69°
50°
6
65°
50°
7
77°
47°
8
69°
40°
9
63°
35°
10
81°
55°
11
67°
42°
12
74°
41°
13
64°
41°
14
N/A
15
70°
46°
16
72°
52°
17
73°
53°
18
74°
40°
19
69°
49°
20
63°
52°
21
67°
50°
22
64°
47°
23
70°
50°
24
66°
51°
25
67°
51°
26
65°
49°
27
66°
50°
28
65°
46°
29
65°
49°
30
63°
45°
1
66°
48°
2
67°
50°
3
65°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Stephen
St. Stephen's September 2026 forecast shows daily high temperatures ranging from 63° to 74°, with overnight lows between 40° and 53°. The average high for September is 67° with an average low of 49°. 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. Stephen. See also: October | November | December.
