S
M
T
W
T
F
S
30
73°
62°
31
69°
56°
1
69°
55°
2
71°
62°
3
72°
65°
4
69°
59°
5
68°
52°
6
78°
57°
7
67°
62°
8
64°
56°
9
64°
53°
10
65°
50°
11
69°
55°
12
69°
55°
13
66°
64°
14
73°
64°
15
67°
55°
16
65°
54°
17
65°
56°
18
65°
53°
19
67°
62°
20
67°
55°
21
71°
52°
22
71°
57°
23
N/A
24
71°
52°
25
67°
53°
26
67°
50°
27
67°
54°
28
65°
50°
29
71°
53°
30
71°
59°
1
65°
56°
2
68°
59°
3
64°
51°
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 64° to 68°, with overnight lows between 51° and 59°. The average high for September is 66° with an average low of 55°. 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.
