S
M
T
W
T
F
S
30
76°
58°
31
76°
57°
1
74°
54°
2
79°
62°
3
83°
57°
4
83°
54°
5
78°
49°
6
78°
52°
7
79°
58°
8
81°
53°
9
80°
47°
10
71°
46°
11
69°
45°
12
70°
47°
13
71°
52°
14
70°
45°
15
69°
42°
16
66°
42°
17
67°
44°
18
67°
43°
19
66°
43°
20
67°
44°
21
68°
47°
22
72°
52°
23
74°
46°
24
76°
52°
25
74°
49°
26
75°
41°
27
65°
49°
28
68°
48°
29
67°
46°
30
66°
46°
1
65°
43°
2
62°
45°
3
63°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mountain Lake
Mountain Lake's September 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 41° and 62°. The average high for September is 72° 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 Mountain Lake. See also: October | November | December.
