S
M
T
W
T
F
S
30
92°
69°
31
90°
63°
1
85°
62°
2
90°
63°
3
88°
73°
4
91°
70°
5
84°
70°
6
75°
66°
7
82°
66°
8
88°
64°
9
82°
55°
10
82°
52°
11
86°
66°
12
73°
48°
13
72°
48°
14
64°
54°
15
72°
50°
16
75°
48°
17
68°
61°
18
64°
63°
19
63°
57°
20
68°
52°
21
55°
48°
22
61°
45°
23
63°
53°
24
64°
51°
25
67°
53°
26
65°
51°
27
68°
48°
28
69°
51°
29
66°
47°
30
69°
46°
1
70°
50°
2
67°
43°
3
63°
49°
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 55° to 70°, with overnight lows between 43° and 53°. The average high for September is 65° 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.
