S
M
T
W
T
F
S
30
73°
56°
31
79°
57°
1
80°
58°
2
80°
53°
3
77°
50°
4
78°
57°
5
77°
56°
6
75°
55°
7
71°
55°
8
70°
54°
9
74°
48°
10
71°
47°
11
70°
55°
12
76°
47°
13
76°
54°
14
75°
53°
15
70°
53°
16
68°
47°
17
75°
44°
18
67°
45°
19
Hist. Avg.
70°
48°
20
Hist. Avg.
70°
47°
21
Hist. Avg.
70°
47°
22
Hist. Avg.
69°
47°
23
Hist. Avg.
69°
46°
24
Hist. Avg.
68°
46°
25
Hist. Avg.
68°
46°
26
Hist. Avg.
68°
45°
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 67° to 80°, with overnight lows between 44° and 58°. The average high for September is 74° 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.
