S
M
T
W
T
F
S
30
82°
66°
31
87°
69°
1
90°
71°
2
94°
73°
3
94°
72°
4
87°
70°
5
82°
68°
6
79°
59°
7
80°
55°
8
83°
56°
9
78°
69°
10
78°
57°
11
81°
52°
12
85°
61°
13
76°
52°
14
73°
59°
15
85°
66°
16
76°
67°
17
76°
62°
18
77°
60°
19
80°
64°
20
78°
60°
21
72°
58°
22
70°
52°
23
72°
54°
24
73°
54°
25
72°
52°
26
74°
53°
27
75°
53°
28
75°
53°
29
72°
52°
30
72°
53°
1
73°
51°
2
72°
49°
3
71°
52°
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 70° to 85°, with overnight lows between 49° and 67°. The average high for September is 74° with an average low of 56°. 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.
