S
M
T
W
T
F
S
30
71°
60°
31
69°
56°
1
69°
54°
2
71°
60°
3
72°
66°
4
66°
59°
5
66°
45°
6
75°
57°
7
66°
61°
8
64°
55°
9
64°
46°
10
64°
52°
11
66°
50°
12
64°
61°
13
66°
64°
14
66°
64°
15
66°
55°
16
61°
55°
17
64°
57°
18
64°
57°
19
66°
61°
20
66°
50°
21
66°
52°
22
66°
61°
23
64°
50°
24
66°
52°
25
64°
46°
26
66°
43°
27
66°
48°
28
65°
57°
29
69°
61°
30
67°
55°
1
64°
59°
2
65°
58°
3
64°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in The Mumbles
The Mumbles's September 2026 forecast shows daily high temperatures ranging from 64° to 69°, with overnight lows between 55° and 61°. The average high for September is 66° with an average low of 58°. 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 The Mumbles. See also: October | November | December.
