S
M
T
W
T
F
S
30
77°
61°
31
75°
63°
1
81°
66°
2
84°
63°
3
85°
67°
4
84°
59°
5
79°
59°
6
76°
51°
7
78°
56°
8
80°
60°
9
78°
67°
10
80°
59°
11
75°
56°
12
75°
60°
13
77°
58°
14
80°
62°
15
82°
59°
16
80°
55°
17
75°
53°
18
70°
50°
19
77°
56°
20
77°
57°
21
75°
55°
22
75°
55°
23
72°
57°
24
74°
53°
25
72°
53°
26
74°
57°
27
74°
56°
28
71°
51°
29
65°
48°
30
66°
49°
1
64°
46°
2
64°
49°
3
63°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cornwall-on-Hudson
Cornwall-on-Hudson's September 2026 forecast shows daily high temperatures ranging from 63° to 85°, with overnight lows between 46° and 67°. The average high for September is 75° with an average low of 56°. 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 Cornwall-on-Hudson. See also: October | November | December.
