S
M
T
W
T
F
S
30
75°
58°
31
78°
51°
1
77°
50°
2
74°
49°
3
73°
51°
4
76°
59°
5
80°
53°
6
79°
48°
7
72°
48°
8
72°
49°
9
75°
55°
10
74°
52°
11
73°
54°
12
70°
54°
13
71°
48°
14
70°
46°
15
68°
45°
16
69°
50°
17
69°
53°
18
74°
53°
19
76°
54°
20
77°
52°
21
74°
44°
22
72°
50°
23
67°
44°
24
68°
43°
25
64°
42°
26
65°
42°
27
Hist. Avg.
67°
45°
28
Hist. Avg.
67°
44°
29
Hist. Avg.
66°
44°
30
Hist. Avg.
66°
44°
1
Hist. Avg.
65°
43°
2
Hist. Avg.
65°
43°
3
Hist. Avg.
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Ithaca
Ithaca's September 2026 forecast shows daily high temperatures ranging from 64° to 80°, with overnight lows between 42° and 59°. The average high for September is 73° with an average low of 50°. 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.
