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
N/A
19
71°
58°
20
65°
55°
21
69°
48°
22
65°
46°
23
64°
50°
24
63°
52°
25
65°
51°
26
67°
52°
27
70°
51°
28
69°
51°
29
70°
52°
30
69°
55°
1
71°
53°
2
70°
49°
3
65°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in New Windsor
New Windsor's September 2026 forecast shows daily high temperatures ranging from 63° to 71°, with overnight lows between 46° and 58°. The average high for September is 68° 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 New Windsor. See also: October | November | December.
