S
M
T
W
T
F
S
30
82°
53°
31
77°
58°
1
68°
62°
2
73°
61°
3
82°
61°
4
84°
62°
5
79°
56°
6
73°
50°
7
81°
46°
8
82°
51°
9
80°
60°
10
87°
60°
11
78°
52°
12
76°
48°
13
71°
63°
14
74°
47°
15
71°
42°
16
79°
51°
17
79°
65°
18
81°
61°
19
67°
51°
20
59°
53°
21
68°
53°
22
64°
46°
23
67°
44°
24
68°
45°
25
72°
53°
26
65°
54°
27
64°
55°
28
67°
52°
29
73°
52°
30
69°
53°
1
73°
53°
2
69°
45°
3
64°
50°
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 64° to 73°, with overnight lows between 44° and 55°. The average high for September is 68° with an average low of 50°. 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.
