S
M
T
W
T
F
S
30
66°
50°
31
73°
48°
1
75°
51°
2
69°
58°
3
75°
57°
4
73°
58°
5
68°
55°
6
66°
48°
7
73°
42°
8
70°
48°
9
65°
43°
10
74°
55°
11
64°
43°
12
71°
38°
13
66°
57°
14
64°
43°
15
68°
35°
16
74°
56°
17
70°
53°
18
67°
47°
19
63°
36°
20
49°
36°
21
55°
42°
22
64°
38°
23
65°
35°
24
68°
33°
25
73°
41°
26
N/A
27
61°
54°
28
61°
53°
29
59°
52°
30
63°
50°
1
70°
50°
2
65°
46°
3
58°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Willoughby
Willoughby's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
