S
M
T
W
T
F
S
30
76°
52°
31
77°
52°
1
76°
53°
2
76°
53°
3
75°
54°
4
73°
53°
5
76°
53°
6
75°
52°
7
74°
51°
8
73°
49°
9
72°
50°
10
74°
56°
11
72°
49°
12
72°
49°
13
75°
48°
14
75°
55°
15
74°
55°
16
73°
52°
17
71°
47°
18
71°
46°
19
72°
48°
20
75°
53°
21
72°
48°
22
69°
50°
23
72°
51°
24
73°
52°
25
74°
51°
26
68°
43°
27
71°
45°
28
65°
44°
29
64°
44°
30
66°
43°
1
65°
42°
2
Hist. Avg.
68°
45°
3
Hist. Avg.
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wallkill
Wallkill's September 2026 forecast shows daily high temperatures ranging from 64° to 77°, with overnight lows between 42° and 56°. The average high for September is 72° with an average low of 50°. 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 Wallkill. See also: October | November | December.
