S
M
T
W
T
F
S
30
77°
61°
31
75°
63°
1
81°
66°
2
84°
63°
3
84°
66°
4
82°
64°
5
77°
59°
6
75°
55°
7
79°
52°
8
79°
55°
9
81°
59°
10
84°
66°
11
77°
57°
12
79°
52°
13
77°
64°
14
73°
50°
15
72°
46°
16
77°
55°
17
77°
68°
18
79°
64°
19
70°
55°
20
64°
59°
21
70°
55°
22
66°
52°
23
66°
52°
24
68°
48°
25
70°
50°
26
63°
57°
27
63°
57°
28
61°
57°
29
70°
57°
30
73°
57°
1
74°
64°
2
83°
52°
3
69°
46°
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 69° to 83°, with overnight lows between 46° and 64°. The average high for September is 75° with an average low of 54°. 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.
