S
M
T
W
T
F
S
30
83°
73°
31
89°
73°
1
92°
71°
2
92°
71°
3
93°
71°
4
92°
73°
5
93°
71°
6
94°
69°
7
87°
70°
8
88°
67°
9
87°
69°
10
88°
71°
11
90°
67°
12
89°
71°
13
91°
73°
14
92°
73°
15
88°
71°
16
86°
65°
17
87°
63°
18
87°
66°
19
90°
70°
20
89°
68°
21
89°
69°
22
85°
71°
23
N/A
24
N/A
25
75°
50°
26
79°
48°
27
80°
51°
28
82°
56°
29
86°
61°
30
86°
65°
1
86°
67°
2
87°
68°
3
85°
66°
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 75° to 87°, with overnight lows between 48° and 68°. The average high for September is 83° with an average low of 59°. 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.
