S
M
T
W
T
F
S
30
82°
55°
31
76°
61°
1
67°
59°
2
75°
58°
3
80°
62°
4
82°
61°
5
72°
58°
6
67°
54°
7
77°
51°
8
79°
54°
9
78°
71°
10
86°
61°
11
77°
48°
12
76°
60°
13
76°
63°
14
82°
58°
15
77°
69°
16
83°
61°
17
76°
59°
18
75°
59°
19
71°
51°
20
69°
55°
21
71°
54°
22
73°
53°
23
68°
58°
24
71°
57°
25
66°
49°
26
66°
51°
27
67°
55°
28
70°
53°
29
65°
52°
30
65°
53°
1
66°
55°
2
70°
54°
3
69°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Swansea
Swansea's September 2026 forecast shows daily high temperatures ranging from 65° to 86°, with overnight lows between 48° and 71°. The average high for September is 73° with an average low of 57°. 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 Swansea. See also: October | November | December.
