S
M
T
W
T
F
S
30
82°
66°
31
89°
65°
1
88°
60°
2
87°
65°
3
86°
68°
4
86°
66°
5
85°
66°
6
83°
66°
7
84°
65°
8
83°
65°
9
81°
56°
10
80°
55°
11
86°
58°
12
74°
49°
13
71°
44°
14
63°
42°
15
72°
47°
16
75°
44°
17
70°
58°
18
63°
58°
19
63°
57°
20
68°
46°
21
61°
43°
22
65°
42°
23
63°
49°
24
63°
54°
25
71°
54°
26
70°
57°
27
68°
53°
28
70°
51°
29
69°
50°
30
69°
52°
1
70°
51°
2
65°
45°
3
62°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Croix Falls
St. Croix Falls's September 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 42° and 57°. The average high for September is 67° 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. Croix Falls. See also: October | November | December.
