S
M
T
W
T
F
S
30
76°
60°
31
82°
63°
1
82°
55°
2
81°
56°
3
74°
55°
4
76°
56°
5
76°
62°
6
80°
61°
7
81°
55°
8
73°
60°
9
73°
61°
10
75°
61°
11
78°
59°
12
77°
59°
13
72°
58°
14
71°
53°
15
72°
52°
16
71°
51°
17
71°
54°
18
70°
57°
19
75°
57°
20
71°
58°
21
75°
56°
22
73°
49°
23
69°
55°
24
68°
57°
25
73°
52°
26
66°
52°
27
72°
55°
28
73°
54°
29
Hist. Avg.
68°
49°
30
Hist. Avg.
68°
49°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
67°
48°
3
Hist. Avg.
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Westchester
Westchester's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 49° and 63°. The average high for September is 74° 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 Westchester. See also: October | November | December.
