S
M
T
W
T
F
S
30
79°
64°
31
84°
57°
1
81°
52°
2
82°
59°
3
90°
64°
4
81°
63°
5
82°
61°
6
82°
61°
7
81°
64°
8
84°
59°
9
73°
52°
10
79°
45°
11
86°
63°
12
68°
45°
13
66°
41°
14
61°
52°
15
71°
42°
16
67°
48°
17
74°
53°
18
64°
57°
19
66°
54°
20
66°
51°
21
67°
47°
22
69°
50°
23
70°
49°
24
71°
50°
25
71°
50°
26
72°
51°
27
71°
52°
28
60°
49°
29
67°
49°
30
68°
44°
1
68°
48°
2
64°
48°
3
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Stephen
St. Stephen's September 2026 forecast shows daily high temperatures ranging from 60° to 74°, with overnight lows between 42° and 57°. The average high for September is 68° with an average low of 50°. 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.
