S
M
T
W
T
F
S
30
N/A
31
N/A
1
N/A
2
N/A
3
N/A
4
N/A
5
N/A
6
N/A
7
N/A
8
N/A
9
82°
53°
10
81°
60°
11
82°
60°
12
78°
51°
13
66°
56°
14
74°
55°
15
73°
52°
16
72°
59°
17
70°
52°
18
72°
54°
19
72°
53°
20
72°
53°
21
71°
54°
22
74°
51°
23
75°
58°
24
77°
57°
25
77°
58°
26
77°
57°
27
76°
57°
28
75°
56°
29
72°
56°
30
73°
53°
1
66°
53°
2
68°
52°
3
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake St. Croix Beach
Lake St. Croix Beach's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 51° and 60°. The average high for September is 74° with an average low of 55°. 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 Lake St. Croix Beach. See also: October | November | December.
