S
M
T
W
T
F
S
30
65°
51°
31
65°
49°
1
66°
49°
2
66°
51°
3
68°
53°
4
69°
54°
5
68°
53°
6
69°
55°
7
67°
52°
8
65°
52°
9
64°
49°
10
Hist. Avg.
65°
51°
11
Hist. Avg.
65°
51°
12
Hist. Avg.
64°
51°
13
Hist. Avg.
64°
51°
14
Hist. Avg.
64°
51°
15
Hist. Avg.
64°
51°
16
Hist. Avg.
64°
51°
17
Hist. Avg.
63°
51°
18
Hist. Avg.
63°
51°
19
Hist. Avg.
63°
50°
20
Hist. Avg.
63°
50°
21
Hist. Avg.
63°
50°
22
Hist. Avg.
63°
50°
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 64° to 69°, with overnight lows between 49° and 55°. The average high for September is 67° with an average low of 52°. 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.
