S
M
T
W
T
F
S
30
80°
61°
31
74°
62°
1
77°
61°
2
77°
54°
3
72°
52°
4
73°
53°
5
75°
56°
6
76°
58°
7
80°
59°
8
81°
59°
9
80°
58°
10
77°
59°
11
72°
52°
12
71°
51°
13
71°
49°
14
72°
48°
15
71°
47°
16
70°
44°
17
69°
46°
18
69°
44°
19
68°
42°
20
67°
43°
21
68°
43°
22
68°
44°
23
70°
46°
24
75°
51°
25
76°
53°
26
75°
52°
27
67°
45°
28
75°
51°
29
67°
41°
30
66°
50°
1
67°
45°
2
74°
38°
3
72°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Marcellus
Marcellus's September 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 38° and 62°. The average high for September is 73° with an average low of 50°. 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 Marcellus. See also: October | November | December.
