S
M
T
W
T
F
S
26
68°
57°
27
71°
53°
28
72°
54°
29
73°
56°
30
74°
57°
31
74°
55°
1
70°
56°
2
70°
56°
3
71°
57°
4
70°
57°
5
70°
55°
6
69°
56°
7
69°
56°
8
70°
55°
9
71°
56°
10
69°
52°
11
69°
53°
12
70°
53°
13
70°
52°
14
69°
54°
15
72°
53°
16
72°
54°
17
73°
54°
18
73°
53°
19
74°
56°
20
74°
58°
21
73°
57°
22
73°
56°
23
72°
56°
24
73°
55°
25
72°
56°
26
72°
56°
27
71°
55°
28
72°
54°
29
69°
51°
30
67°
52°
31
70°
52°
1
68°
53°
2
71°
53°
3
68°
52°
4
68°
53°
5
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Cardiff
Cardiff's August 2026 forecast shows daily high temperatures ranging from 65° to 74°, with overnight lows between 51° and 58°. The average high for August is 71° 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 August weather will actually feel in Cardiff. See also: September | October | November.
