S
M
T
W
T
F
S
30
80°
53°
31
79°
45°
1
76°
42°
2
70°
43°
3
69°
48°
4
73°
53°
5
76°
45°
6
75°
43°
7
67°
43°
8
72°
48°
9
74°
50°
10
71°
50°
11
72°
49°
12
72°
50°
13
71°
47°
14
64°
40°
15
63°
39°
16
63°
40°
17
64°
48°
18
65°
40°
19
65°
49°
20
69°
47°
21
70°
40°
22
63°
38°
23
60°
38°
24
59°
37°
25
57°
35°
26
64°
43°
27
65°
42°
28
Hist. Avg.
61°
40°
29
Hist. Avg.
61°
40°
30
Hist. Avg.
60°
40°
1
Hist. Avg.
60°
39°
2
Hist. Avg.
59°
39°
3
Hist. Avg.
59°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Saint-Joseph
Saint-Joseph's September 2026 forecast shows daily high temperatures ranging from 57° to 80°, with overnight lows between 35° and 53°. The average high for September is 69° with an average low of 44°. 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-Joseph. See also: October | November | December.
