S
M
T
W
T
F
S
30
78°
57°
31
79°
64°
1
73°
67°
2
68°
66°
3
87°
67°
4
83°
58°
5
80°
57°
6
77°
51°
7
78°
55°
8
79°
59°
9
79°
64°
10
80°
59°
11
76°
53°
12
75°
56°
13
77°
58°
14
72°
52°
15
75°
53°
16
71°
55°
17
72°
48°
18
69°
46°
19
76°
51°
20
76°
53°
21
75°
50°
22
75°
52°
23
69°
53°
24
73°
49°
25
72°
48°
26
74°
52°
27
73°
51°
28
70°
45°
29
64°
43°
30
65°
45°
1
63°
41°
2
63°
46°
3
62°
43°
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 62° to 87°, with overnight lows between 41° and 67°. The average high for September is 73° with an average low of 52°. 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.
