S
M
T
W
T
F
S
30
87°
73°
31
91°
73°
1
95°
71°
2
95°
73°
3
93°
72°
4
93°
73°
5
95°
73°
6
93°
70°
7
88°
72°
8
88°
70°
9
90°
70°
10
90°
73°
11
91°
72°
12
90°
72°
13
91°
73°
14
93°
72°
15
88°
70°
16
86°
66°
17
88°
64°
18
86°
66°
19
91°
70°
20
88°
72°
21
90°
70°
22
90°
72°
23
73°
66°
24
68°
61°
25
77°
49°
26
81°
51°
27
83°
53°
28
84°
57°
29
87°
62°
30
87°
63°
1
86°
65°
2
85°
66°
3
86°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Allendale
Allendale's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 49° and 66°. The average high for September is 84° with an average low of 59°. 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 Allendale. See also: October | November | December.
