S
M
T
W
T
F
S
26
86°
51°
27
86°
53°
28
91°
56°
29
91°
54°
30
86°
55°
31
85°
53°
1
84°
54°
2
85°
53°
3
83°
56°
4
86°
55°
5
84°
51°
6
85°
50°
7
85°
51°
8
86°
52°
9
89°
53°
10
90°
55°
11
90°
54°
12
91°
55°
13
90°
53°
14
85°
49°
15
83°
51°
16
83°
50°
17
84°
50°
18
87°
54°
19
85°
51°
20
83°
51°
21
82°
50°
22
82°
51°
23
86°
53°
24
82°
51°
25
80°
52°
26
86°
53°
27
80°
48°
28
80°
48°
29
81°
49°
30
82°
47°
31
81°
44°
1
80°
46°
2
80°
45°
3
82°
51°
4
83°
46°
5
84°
48°
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 80° to 91°, with overnight lows between 44° and 56°. The average high for August is 85° 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 August weather will actually feel in Cardiff. See also: September | October | November.
