S
M
T
W
T
F
S
30
77°
55°
31
79°
48°
1
78°
48°
2
54°
32°
3
54°
39°
4
57°
42°
5
58°
41°
6
55°
43°
7
52°
39°
8
52°
38°
9
56°
37°
10
57°
36°
11
56°
37°
12
57°
37°
13
55°
35°
14
56°
34°
15
55°
32°
16
60°
39°
17
59°
37°
18
54°
36°
19
49°
26°
20
46°
25°
21
48°
31°
22
54°
32°
23
57°
36°
24
53°
30°
25
44°
24°
26
43°
24°
27
50°
30°
28
54°
31°
29
53°
30°
30
54°
31°
1
53°
32°
2
53°
32°
3
52°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mirror Lake Campground
Mirror Lake Campground's September 2026 forecast shows daily high temperatures ranging from 43° to 60°, with overnight lows between 24° and 43°. The average high for September is 53° with an average low of 34°. 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 Campground. See also: October | November | December.
