S
M
T
W
T
F
S
30
77°
58°
31
78°
57°
1
77°
52°
2
70°
49°
3
70°
49°
4
70°
50°
5
71°
49°
6
75°
57°
7
78°
56°
8
78°
57°
9
76°
56°
10
78°
56°
11
77°
55°
12
78°
56°
13
79°
57°
14
79°
46°
15
67°
47°
16
65°
45°
17
67°
48°
18
68°
46°
19
66°
43°
20
66°
44°
21
74°
48°
22
75°
51°
23
74°
42°
24
69°
40°
25
66°
41°
26
69°
48°
27
71°
50°
28
70°
47°
29
66°
38°
30
62°
39°
1
61°
46°
2
65°
43°
3
68°
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 61° to 79°, with overnight lows between 38° and 58°. The average high for September is 71° with an average low of 49°. 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.
