S
M
T
W
T
F
S
30
84°
41°
31
90°
42°
1
85°
57°
2
75°
48°
3
79°
53°
4
72°
48°
5
78°
42°
6
79°
43°
7
75°
33°
8
84°
36°
9
90°
39°
10
88°
46°
11
90°
52°
12
90°
42°
13
76°
47°
14
73°
32°
15
81°
32°
16
67°
41°
17
62°
38°
18
62°
41°
19
68°
46°
20
72°
51°
21
73°
46°
22
71°
45°
23
68°
50°
24
69°
49°
25
63°
43°
26
58°
40°
27
55°
41°
28
55°
40°
29
69°
39°
30
66°
44°
1
65°
45°
2
72°
45°
3
67°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Summit Lake
Summit Lake's September 2026 forecast shows daily high temperatures ranging from 55° to 73°, with overnight lows between 38° and 51°. The average high for September is 66° with an average low of 44°. 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 Summit Lake. See also: October | November | December.
