S
M
T
W
T
F
S
30
67°
51°
31
69°
52°
1
67°
53°
2
70°
53°
3
68°
52°
4
68°
53°
5
65°
52°
6
65°
52°
7
67°
49°
8
65°
54°
9
64°
50°
10
66°
49°
11
64°
53°
12
63°
52°
13
63°
54°
14
65°
52°
15
67°
49°
16
67°
50°
17
Hist. Avg.
63°
51°
18
Hist. Avg.
63°
50°
19
Hist. Avg.
63°
50°
20
Hist. Avg.
63°
50°
21
Hist. Avg.
62°
50°
22
Hist. Avg.
62°
50°
23
Hist. Avg.
62°
50°
24
Hist. Avg.
62°
50°
25
Hist. Avg.
62°
50°
26
Hist. Avg.
61°
49°
27
Hist. Avg.
61°
49°
28
Hist. Avg.
61°
49°
29
Hist. Avg.
61°
49°
30
Hist. Avg.
61°
49°
1
Hist. Avg.
60°
49°
2
Hist. Avg.
60°
49°
3
Hist. Avg.
60°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Llantwit Major
Llantwit Major's September 2026 forecast shows daily high temperatures ranging from 63° to 70°, with overnight lows between 49° and 54°. The average high for September is 66° 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 Llantwit Major. See also: October | November | December.
