S
M
T
W
T
F
S
30
76°
55°
31
79°
54°
1
79°
50°
2
74°
49°
3
70°
49°
4
70°
50°
5
71°
48°
6
73°
56°
7
78°
58°
8
81°
51°
9
77°
49°
10
72°
48°
11
72°
56°
12
74°
47°
13
75°
46°
14
69°
45°
15
69°
49°
16
71°
54°
17
75°
45°
18
69°
46°
19
69°
46°
20
73°
44°
21
68°
52°
22
67°
53°
23
77°
53°
24
76°
51°
25
75°
52°
26
75°
52°
27
76°
51°
28
75°
50°
29
73°
51°
30
74°
51°
1
75°
40°
2
75°
38°
3
63°
40°
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 63° to 81°, with overnight lows between 38° and 58°. The average high for September is 73° with an average low of 49°. 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.
