S
M
T
W
T
F
S
30
74°
44°
31
73°
47°
1
74°
46°
2
71°
46°
3
64°
49°
4
68°
59°
5
66°
52°
6
54°
49°
7
69°
44°
8
66°
37°
9
60°
33°
10
73°
55°
11
65°
41°
12
69°
37°
13
63°
49°
14
73°
50°
15
69°
39°
16
65°
38°
17
68°
44°
18
71°
49°
19
62°
44°
20
59°
34°
21
65°
37°
22
64°
36°
23
62°
33°
24
73°
40°
25
71°
47°
26
65°
52°
27
63°
52°
28
61°
53°
29
61°
47°
30
64°
48°
1
69°
47°
2
67°
44°
3
65°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sussex
Sussex's September 2026 forecast shows daily high temperatures ranging from 61° to 73°, with overnight lows between 40° and 53°. The average high for September is 66° with an average low of 47°. 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 Sussex. See also: October | November | December.
