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
66°
44°
23
67°
42°
24
69°
45°
25
69°
55°
26
65°
54°
27
69°
54°
28
70°
53°
29
72°
52°
30
71°
53°
1
74°
52°
2
70°
48°
3
65°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Southampton
Southampton's September 2026 forecast shows daily high temperatures ranging from 65° to 74°, with overnight lows between 42° and 55°. The average high for September is 69° 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 Southampton. See also: October | November | December.
