S
M
T
W
T
F
S
30
87°
68°
31
86°
65°
1
86°
65°
2
82°
68°
3
87°
70°
4
89°
69°
5
91°
67°
6
87°
64°
7
79°
64°
8
78°
59°
9
80°
57°
10
79°
54°
11
75°
52°
12
77°
53°
13
73°
54°
14
74°
50°
15
79°
56°
16
77°
54°
17
78°
56°
18
79°
56°
19
77°
54°
20
77°
55°
21
78°
56°
22
79°
56°
23
79°
55°
24
78°
55°
25
78°
54°
26
77°
54°
27
78°
53°
28
77°
53°
29
76°
52°
30
77°
54°
1
76°
54°
2
76°
53°
3
75°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake Crystal
Lake Crystal's September 2026 forecast shows daily high temperatures ranging from 73° to 91°, with overnight lows between 50° and 70°. The average high for September is 79° with an average low of 57°. 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 Crystal. See also: October | November | December.
