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
64°
41°
15
69°
39°
16
67°
43°
17
60°
40°
18
62°
44°
19
71°
46°
20
74°
48°
21
66°
43°
22
58°
42°
23
67°
50°
24
62°
44°
25
65°
43°
26
64°
47°
27
64°
42°
28
62°
42°
29
62°
45°
30
66°
44°
1
65°
45°
2
71°
44°
3
61°
42°
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 58° to 74°, with overnight lows between 39° and 50°. The average high for September is 65° 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.
