S
M
T
W
T
F
S
30
77°
58°
31
82°
60°
1
82°
60°
2
81°
59°
3
82°
53°
4
81°
50°
5
74°
52°
6
75°
58°
7
76°
57°
8
79°
58°
9
80°
56°
10
77°
57°
11
80°
56°
12
79°
56°
13
79°
57°
14
78°
57°
15
79°
56°
16
79°
50°
17
77°
56°
18
75°
51°
19
76°
49°
20
72°
47°
21
69°
44°
22
68°
52°
23
68°
49°
24
73°
45°
25
67°
44°
26
66°
44°
27
69°
48°
28
72°
50°
29
73°
47°
30
71°
46°
1
65°
49°
2
65°
41°
3
65°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Southwick
Southwick's September 2026 forecast shows daily high temperatures ranging from 65° to 82°, with overnight lows between 41° and 60°. The average high for September is 75° 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 Southwick. See also: October | November | December.
