S
M
T
W
T
F
S
30
67°
52°
31
66°
54°
1
73°
53°
2
73°
47°
3
71°
43°
4
69°
49°
5
72°
41°
6
65°
41°
7
63°
47°
8
67°
50°
9
64°
46°
10
67°
42°
11
63°
49°
12
68°
41°
13
65°
43°
14
66°
47°
15
70°
45°
16
69°
38°
17
Hist. Avg.
65°
50°
18
Hist. Avg.
65°
50°
19
Hist. Avg.
64°
50°
20
Hist. Avg.
64°
49°
21
Hist. Avg.
63°
49°
22
Hist. Avg.
63°
49°
23
Hist. Avg.
63°
48°
24
Hist. Avg.
62°
48°
25
Hist. Avg.
62°
48°
26
Hist. Avg.
61°
47°
27
Hist. Avg.
61°
47°
28
Hist. Avg.
60°
47°
29
Hist. Avg.
60°
47°
30
Hist. Avg.
60°
46°
1
Hist. Avg.
59°
46°
2
Hist. Avg.
59°
46°
3
Hist. Avg.
58°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Saint-Jean
Saint-Jean's September 2026 forecast shows daily high temperatures ranging from 63° to 73°, with overnight lows between 38° and 54°. 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 Saint-Jean. See also: October | November | December.
