S
M
T
W
T
F
S
31
77°
42°
1
77°
44°
2
79°
46°
3
75°
49°
4
65°
44°
5
66°
47°
6
61°
41°
7
67°
36°
8
67°
34°
9
74°
37°
10
78°
46°
11
79°
47°
12
81°
44°
13
80°
51°
14
83°
47°
15
82°
52°
16
80°
50°
17
83°
44°
18
88°
54°
19
77°
59°
20
81°
53°
21
75°
57°
22
78°
57°
23
78°
59°
24
69°
60°
25
75°
52°
26
81°
49°
27
86°
53°
28
79°
46°
29
83°
43°
30
81°
46°
1
73°
43°
2
78°
37°
3
87°
42°
4
90°
53°
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.
