S
M
T
W
T
F
S
30
78°
57°
31
71°
64°
1
84°
68°
2
74°
65°
3
84°
65°
4
80°
66°
5
73°
56°
6
73°
49°
7
75°
51°
8
77°
58°
9
82°
67°
10
75°
53°
11
67°
47°
12
73°
53°
13
74°
56°
14
70°
50°
15
76°
56°
16
73°
52°
17
70°
51°
18
69°
48°
19
72°
47°
20
73°
50°
21
71°
52°
22
64°
52°
23
65°
51°
24
66°
51°
25
66°
50°
26
71°
49°
27
67°
45°
28
69°
50°
29
70°
50°
30
71°
49°
1
70°
49°
2
69°
48°
3
68°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clarks Summit
Clarks Summit's September 2026 forecast shows daily high temperatures ranging from 64° to 82°, with overnight lows between 45° and 67°. The average high for September is 71° with an average low of 51°. 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 Clarks Summit. See also: October | November | December.
