S
M
T
W
T
F
S
30
73°
65°
31
87°
69°
1
86°
74°
2
92°
73°
3
85°
67°
4
78°
66°
5
76°
58°
6
75°
55°
7
76°
53°
8
81°
57°
9
88°
72°
10
77°
68°
11
75°
57°
12
74°
58°
13
80°
64°
14
68°
51°
15
81°
55°
16
79°
69°
17
74°
68°
18
73°
59°
19
70°
61°
20
68°
61°
21
65°
59°
22
65°
58°
23
66°
51°
24
68°
49°
25
65°
53°
26
69°
57°
27
68°
57°
28
70°
56°
29
71°
59°
30
73°
58°
1
73°
59°
2
68°
53°
3
65°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Willoughby
Willoughby's September 2026 forecast shows daily high temperatures ranging from 65° to 73°, with overnight lows between 49° and 60°. The average high for September is 68° 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 Willoughby. See also: October | November | December.
