S
M
T
W
T
F
S
30
79°
68°
31
80°
67°
1
82°
66°
2
75°
63°
3
74°
62°
4
74°
64°
5
77°
65°
6
81°
66°
7
82°
67°
8
82°
67°
9
81°
66°
10
81°
66°
11
79°
65°
12
81°
66°
13
81°
66°
14
77°
56°
15
69°
57°
16
71°
60°
17
74°
59°
18
69°
54°
19
70°
53°
20
70°
56°
21
77°
60°
22
77°
61°
23
76°
52°
24
70°
54°
25
71°
57°
26
75°
60°
27
75°
58°
28
74°
50°
29
68°
48°
30
65°
52°
1
65°
55°
2
72°
54°
3
73°
58°
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 82°, with overnight lows between 48° and 68°. The average high for September is 75° with an average low of 60°. 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.
