S
M
T
W
T
F
S
30
82°
63°
31
79°
69°
1
84°
68°
2
72°
65°
3
88°
67°
4
85°
73°
5
80°
68°
6
78°
64°
7
79°
58°
8
81°
63°
9
85°
69°
10
84°
63°
11
77°
56°
12
76°
58°
13
79°
61°
14
81°
60°
15
78°
59°
16
76°
53°
17
75°
56°
18
74°
55°
19
73°
54°
20
72°
52°
21
73°
56°
22
67°
56°
23
67°
55°
24
68°
55°
25
69°
52°
26
73°
51°
27
68°
48°
28
68°
51°
29
73°
54°
30
74°
54°
1
73°
53°
2
72°
53°
3
71°
50°
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 67° to 85°, with overnight lows between 48° and 69°. 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 Allendale. See also: October | November | December.
