S
M
T
W
T
F
S
31
72°
41°
1
75°
46°
2
77°
48°
3
79°
48°
4
77°
59°
5
78°
46°
6
65°
53°
7
65°
41°
8
65°
38°
9
73°
42°
10
74°
44°
11
75°
46°
12
75°
46°
13
73°
54°
14
75°
54°
15
75°
46°
16
79°
52°
17
75°
54°
18
79°
48°
19
70°
52°
20
72°
39°
21
73°
55°
22
77°
61°
23
70°
63°
24
73°
59°
25
70°
61°
26
73°
57°
27
75°
52°
28
81°
52°
29
75°
46°
30
73°
47°
1
64°
34°
2
70°
36°
3
77°
50°
4
81°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ithaca
Ithaca's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
