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°
44°
19
69°
55°
20
63°
45°
21
62°
43°
22
59°
43°
23
61°
44°
24
61°
44°
25
65°
46°
26
66°
49°
27
66°
48°
28
65°
47°
29
66°
51°
30
68°
52°
1
67°
36°
2
66°
48°
3
60°
47°
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 59° to 72°, with overnight lows between 36° and 55°. The average high for September is 65° with an average low of 46°. 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.
