S
M
T
W
T
F
S
30
85°
63°
31
83°
57°
1
80°
56°
2
79°
57°
3
79°
57°
4
81°
60°
5
83°
62°
6
79°
63°
7
84°
61°
8
79°
56°
9
77°
55°
10
77°
55°
11
76°
53°
12
76°
54°
13
75°
55°
14
74°
53°
15
75°
54°
16
76°
56°
17
75°
53°
18
76°
58°
19
80°
59°
20
74°
53°
21
78°
52°
22
Hist. Avg.
76°
53°
23
Hist. Avg.
76°
53°
24
Hist. Avg.
76°
52°
25
Hist. Avg.
75°
52°
26
Hist. Avg.
75°
51°
27
Hist. Avg.
75°
51°
28
Hist. Avg.
74°
51°
29
Hist. Avg.
74°
50°
30
Hist. Avg.
74°
50°
1
Hist. Avg.
73°
49°
2
Hist. Avg.
73°
49°
3
Hist. Avg.
72°
49°
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 74° to 85°, with overnight lows between 52° and 63°. The average high for September is 78° with an average low of 57°. 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.
