S
M
T
W
T
F
S
30
82°
69°
31
78°
71°
1
83°
67°
2
76°
69°
3
86°
70°
4
85°
67°
5
80°
63°
6
75°
66°
7
78°
65°
8
77°
64°
9
78°
66°
10
81°
64°
11
78°
65°
12
77°
64°
13
78°
64°
14
76°
62°
15
73°
62°
16
74°
66°
17
75°
59°
18
72°
57°
19
71°
57°
20
72°
60°
21
76°
64°
22
79°
65°
23
80°
65°
24
79°
62°
25
77°
60°
26
77°
62°
27
78°
63°
28
77°
63°
29
78°
59°
30
71°
55°
1
67°
54°
2
70°
58°
3
75°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westchester
Westchester's September 2026 forecast shows daily high temperatures ranging from 67° to 86°, with overnight lows between 54° and 70°. The average high for September is 77° with an average low of 63°. 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 Westchester. See also: October | November | December.
