S
M
T
W
T
F
S
30
72°
55°
31
73°
57°
1
73°
48°
2
68°
59°
3
75°
64°
4
70°
55°
5
72°
50°
6
77°
52°
7
73°
57°
8
66°
54°
9
66°
48°
10
66°
46°
11
70°
48°
12
72°
45°
13
73°
61°
14
72°
57°
15
N/A
16
68°
56°
17
69°
49°
18
65°
60°
19
70°
57°
20
70°
52°
21
73°
55°
22
71°
55°
23
72°
57°
24
73°
53°
25
70°
54°
26
68°
55°
27
69°
53°
28
65°
51°
29
65°
50°
30
64°
48°
1
64°
46°
2
65°
50°
3
65°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Southampton
Southampton's September 2026 forecast shows daily high temperatures ranging from 64° to 73°, with overnight lows between 46° and 60°. The average high for September is 68° with an average low of 53°. 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.
