S
M
T
W
T
F
S
30
75°
57°
31
76°
55°
1
80°
56°
2
77°
54°
3
76°
55°
4
77°
52°
5
74°
52°
6
71°
50°
7
78°
58°
8
79°
58°
9
79°
57°
10
75°
54°
11
78°
57°
12
79°
55°
13
73°
52°
14
73°
52°
15
75°
55°
16
77°
55°
17
78°
54°
18
76°
50°
19
66°
46°
20
69°
52°
21
69°
49°
22
71°
50°
23
69°
46°
24
63°
43°
25
63°
41°
26
62°
41°
27
63°
43°
28
64°
44°
29
69°
50°
30
71°
49°
1
71°
43°
2
60°
41°
3
61°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ithaca
Ithaca's September 2026 forecast shows daily high temperatures ranging from 60° to 80°, with overnight lows between 41° and 58°. The average high for September is 72° 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 Ithaca. See also: October | November | December.
