S
M
T
W
T
F
S
30
70°
48°
31
70°
47°
1
72°
51°
2
72°
55°
3
71°
57°
4
77°
58°
5
80°
56°
6
79°
48°
7
76°
47°
8
70°
47°
9
71°
46°
10
70°
52°
11
70°
53°
12
68°
48°
13
72°
52°
14
75°
52°
15
75°
51°
16
69°
53°
17
68°
51°
18
72°
50°
19
72°
44°
20
70°
47°
21
72°
44°
22
72°
41°
23
65°
42°
24
64°
43°
25
64°
45°
26
65°
40°
27
63°
40°
28
63°
43°
29
61°
39°
30
61°
38°
1
62°
42°
2
67°
38°
3
63°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mirror Lake
Mirror Lake's September 2026 forecast shows daily high temperatures ranging from 61° to 80°, with overnight lows between 38° and 58°. The average high for September is 69° with an average low of 47°. 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 Mirror Lake. See also: October | November | December.
