S
M
T
W
T
F
S
30
75°
58°
31
80°
59°
1
80°
59°
2
79°
58°
3
80°
52°
4
79°
49°
5
72°
51°
6
73°
57°
7
74°
57°
8
77°
55°
9
78°
56°
10
77°
55°
11
76°
54°
12
77°
55°
13
76°
56°
14
76°
56°
15
77°
55°
16
77°
51°
17
75°
55°
18
73°
53°
19
74°
51°
20
71°
46°
21
67°
44°
22
66°
50°
23
66°
49°
24
72°
44°
25
65°
43°
26
64°
43°
27
66°
48°
28
70°
50°
29
69°
46°
30
69°
45°
1
63°
48°
2
63°
41°
3
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wales
Wales's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 41° and 59°. The average high for September is 73° with an average low of 51°. 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 Wales. See also: October | November | December.
