S
M
T
W
T
F
S
30
74°
59°
31
68°
58°
1
81°
64°
2
80°
62°
3
80°
66°
4
77°
57°
5
73°
55°
6
72°
49°
7
73°
48°
8
77°
50°
9
74°
57°
10
78°
61°
11
71°
49°
12
77°
49°
13
82°
62°
14
66°
44°
15
70°
41°
16
74°
58°
17
73°
65°
18
72°
54°
19
68°
40°
20
64°
52°
21
61°
41°
22
66°
50°
23
68°
42°
24
69°
38°
25
69°
35°
26
68°
43°
27
58°
53°
28
62°
52°
29
64°
48°
30
73°
56°
1
78°
58°
2
64°
44°
3
62°
43°
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 58° to 78°, with overnight lows between 43° and 58°. The average high for September is 66° 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.
