S
M
T
W
T
F
S
30
70°
56°
31
71°
54°
1
69°
54°
2
67°
55°
3
68°
55°
4
69°
51°
5
69°
50°
6
67°
50°
7
66°
52°
8
67°
54°
9
66°
53°
10
68°
52°
11
64°
53°
12
68°
53°
13
67°
52°
14
68°
53°
15
67°
52°
16
66°
53°
17
67°
52°
18
63°
52°
19
63°
48°
20
63°
53°
21
63°
51°
22
65°
52°
23
Hist. Avg.
62°
50°
24
Hist. Avg.
62°
50°
25
Hist. Avg.
62°
50°
26
Hist. Avg.
62°
50°
27
Hist. Avg.
62°
49°
28
Hist. Avg.
62°
49°
29
Hist. Avg.
62°
49°
30
Hist. Avg.
61°
49°
1
Hist. Avg.
61°
49°
2
Hist. Avg.
61°
49°
3
Hist. Avg.
61°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in The Mumbles
The Mumbles's September 2026 forecast shows daily high temperatures ranging from 63° to 71°, with overnight lows between 48° and 56°. The average high for September is 67° 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 The Mumbles. See also: October | November | December.
