S
M
T
W
T
F
S
30
83°
67°
31
88°
69°
1
91°
69°
2
95°
76°
3
90°
73°
4
89°
71°
5
84°
68°
6
79°
58°
7
81°
53°
8
81°
56°
9
77°
69°
10
75°
55°
11
80°
50°
12
85°
64°
13
72°
52°
14
74°
45°
15
83°
63°
16
78°
66°
17
73°
65°
18
76°
57°
19
69°
57°
20
66°
59°
21
68°
52°
22
68°
47°
23
67°
52°
24
73°
50°
25
67°
45°
26
68°
40°
27
66°
40°
28
72°
44°
29
75°
45°
30
65°
61°
1
73°
61°
2
64°
44°
3
68°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Joseph
St. Joseph's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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. Joseph. See also: October | November | December.
