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
67°
48°
22
65°
44°
23
64°
45°
24
64°
47°
25
61°
52°
26
65°
52°
27
71°
46°
28
70°
48°
29
69°
47°
30
72°
48°
1
71°
47°
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 59° to 72°, with overnight lows between 44° and 53°. The average high for September is 67° with an average low of 48°. 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.
