S
M
T
W
T
F
S
31
77°
53°
1
80°
51°
2
82°
57°
3
63°
39°
4
69°
36°
5
60°
43°
6
65°
38°
7
67°
33°
8
81°
47°
9
77°
53°
10
75°
52°
11
81°
53°
12
79°
59°
13
79°
57°
14
87°
65°
15
85°
61°
16
84°
58°
17
71°
57°
18
77°
63°
19
66°
62°
20
71°
59°
21
76°
52°
22
78°
48°
23
82°
51°
24
78°
56°
25
85°
50°
26
85°
45°
27
76°
48°
28
84°
49°
29
93°
56°
30
82°
57°
1
84°
60°
2
86°
54°
3
91°
53°
4
87°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Summit
Summit's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
