S
M
T
W
T
F
S
30
73°
58°
31
87°
65°
1
89°
72°
2
93°
71°
3
86°
67°
4
78°
64°
5
78°
57°
6
78°
56°
7
77°
54°
8
82°
53°
9
86°
69°
10
82°
65°
11
77°
57°
12
75°
57°
13
83°
65°
14
70°
49°
15
80°
48°
16
82°
69°
17
77°
62°
18
74°
55°
19
74°
65°
20
71°
56°
21
69°
61°
22
70°
60°
23
68°
55°
24
71°
53°
25
70°
52°
26
72°
52°
27
75°
53°
28
73°
54°
29
69°
39°
30
73°
54°
1
73°
54°
2
67°
53°
3
64°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cortland
Cortland's September 2026 forecast shows daily high temperatures ranging from 64° to 82°, with overnight lows between 39° and 69°. The average high for September is 72° 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 Cortland. See also: October | November | December.
