S
M
T
W
T
F
S
30
71°
54°
31
64°
55°
1
78°
64°
2
75°
63°
3
81°
63°
4
73°
55°
5
72°
54°
6
70°
50°
7
72°
45°
8
75°
45°
9
72°
57°
10
75°
59°
11
70°
48°
12
73°
46°
13
79°
61°
14
64°
45°
15
70°
41°
16
73°
55°
17
73°
63°
18
70°
52°
19
64°
37°
20
63°
52°
21
63°
45°
22
64°
46°
23
64°
41°
24
64°
36°
25
68°
34°
26
66°
43°
27
57°
52°
28
61°
54°
29
63°
48°
30
73°
46°
1
68°
55°
2
68°
46°
3
63°
41°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
