S
M
T
W
T
F
S
26
71°
57°
27
71°
55°
28
70°
58°
29
68°
57°
30
66°
55°
31
66°
53°
1
67°
53°
2
66°
52°
3
67°
54°
4
70°
58°
5
71°
58°
6
68°
57°
7
66°
56°
8
66°
54°
9
67°
57°
10
67°
54°
11
71°
58°
12
71°
57°
13
70°
57°
14
71°
56°
15
71°
58°
16
70°
56°
17
70°
56°
18
69°
54°
19
66°
51°
20
65°
51°
21
65°
50°
22
66°
51°
23
65°
54°
24
65°
51°
25
66°
51°
26
65°
55°
27
64°
55°
28
64°
51°
29
66°
50°
30
65°
51°
31
64°
50°
1
66°
51°
2
67°
53°
3
68°
54°
4
67°
49°
5
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Merthyr Vale
Merthyr Vale's August 2026 forecast shows daily high temperatures ranging from 64° to 71°, with overnight lows between 48° and 58°. The average high for August is 67° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Merthyr Vale. See also: September | October | November.
