S
M
T
W
T
F
S
30
82°
62°
31
80°
65°
1
79°
67°
2
78°
66°
3
81°
61°
4
77°
58°
5
76°
56°
6
77°
57°
7
78°
57°
8
79°
56°
9
80°
58°
10
75°
57°
11
72°
50°
12
72°
51°
13
73°
50°
14
76°
55°
15
78°
56°
16
78°
56°
17
76°
55°
18
78°
56°
19
78°
57°
20
73°
56°
21
76°
55°
22
77°
56°
23
76°
55°
24
77°
53°
25
70°
50°
26
66°
46°
27
68°
48°
28
73°
51°
29
74°
52°
30
74°
51°
1
73°
51°
2
73°
52°
3
72°
52°
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 66° to 82°, with overnight lows between 46° and 67°. The average high for September is 76° with an average low of 55°. 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.
