S
M
T
W
T
F
S
30
57°
40°
31
61°
38°
1
55°
34°
2
53°
33°
3
51°
33°
4
50°
34°
5
51°
30°
6
51°
34°
7
52°
33°
8
50°
32°
9
49°
31°
10
49°
31°
11
48°
30°
12
49°
31°
13
48°
30°
14
49°
30°
15
47°
29°
16
47°
30°
17
49°
35°
18
48°
33°
19
49°
29°
20
45°
27°
21
Hist. Avg.
48°
28°
22
Hist. Avg.
47°
28°
23
Hist. Avg.
47°
28°
24
Hist. Avg.
46°
27°
25
Hist. Avg.
46°
27°
26
Hist. Avg.
45°
26°
27
Hist. Avg.
44°
26°
28
Hist. Avg.
44°
25°
29
Hist. Avg.
43°
24°
30
Hist. Avg.
43°
24°
1
Hist. Avg.
42°
23°
2
Hist. Avg.
41°
23°
3
Hist. Avg.
41°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Summit
Summit's September 2026 forecast shows daily high temperatures ranging from 45° to 61°, with overnight lows between 27° and 40°. The average high for September is 50° with an average low of 32°. 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. See also: October | November | December.
