S
M
T
W
T
F
S
30
88°
55°
31
78°
58°
1
78°
53°
2
79°
61°
3
71°
56°
4
81°
54°
5
84°
55°
6
83°
54°
7
87°
56°
8
93°
59°
9
95°
61°
10
90°
60°
11
89°
59°
12
89°
58°
13
88°
57°
14
90°
58°
15
102°
61°
16
86°
57°
17
92°
58°
18
87°
59°
19
93°
58°
20
93°
59°
21
92°
59°
22
92°
57°
23
86°
58°
24
89°
57°
25
91°
58°
26
93°
59°
27
93°
60°
28
92°
59°
29
91°
59°
30
90°
57°
1
91°
58°
2
88°
57°
3
83°
56°
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 71° to 102°, with overnight lows between 54° and 61°. The average high for September is 89° with an average low of 58°. 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.
