S
M
T
W
T
F
S
30
78°
63°
31
77°
64°
1
87°
64°
2
86°
67°
3
87°
63°
4
88°
55°
5
84°
56°
6
79°
56°
7
81°
60°
8
83°
61°
9
80°
51°
10
76°
50°
11
74°
49°
12
74°
53°
13
73°
58°
14
75°
48°
15
76°
46°
16
72°
46°
17
71°
47°
18
72°
46°
19
70°
46°
20
70°
47°
21
71°
46°
22
73°
48°
23
75°
51°
24
79°
54°
25
78°
53°
26
79°
44°
27
71°
54°
28
70°
44°
29
76°
46°
30
69°
48°
1
71°
46°
2
73°
48°
3
68°
50°
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 68° to 88°, with overnight lows between 44° and 67°. The average high for September is 76° with an average low of 52°. 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.
