S
M
T
W
T
F
S
30
71°
50°
31
70°
50°
1
72°
55°
2
73°
56°
3
74°
57°
4
71°
56°
5
76°
57°
6
78°
58°
7
77°
57°
8
76°
56°
9
72°
56°
10
73°
55°
11
72°
56°
12
72°
55°
13
68°
55°
14
68°
54°
15
69°
54°
16
68°
53°
17
70°
54°
18
70°
53°
19
72°
53°
20
71°
52°
21
77°
52°
22
77°
42°
23
68°
41°
24
66°
43°
25
69°
47°
26
65°
51°
27
71°
51°
28
71°
49°
29
73°
49°
30
73°
51°
1
72°
51°
2
73°
47°
3
70°
50°
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 65° to 78°, with overnight lows between 41° and 58°. The average high for September is 72° with an average low of 52°. 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.
