S
M
T
W
T
F
S
26
86°
67°
27
86°
67°
28
85°
66°
29
87°
67°
30
86°
66°
31
85°
64°
1
80°
62°
2
78°
59°
3
79°
63°
4
80°
64°
5
82°
65°
6
84°
65°
7
85°
64°
8
85°
65°
9
84°
65°
10
85°
64°
11
85°
64°
12
86°
63°
13
85°
65°
14
88°
57°
15
86°
59°
16
82°
62°
17
81°
61°
18
84°
60°
19
86°
56°
20
79°
54°
21
78°
53°
22
78°
55°
23
79°
55°
24
79°
56°
25
80°
59°
26
78°
55°
27
85°
58°
28
85°
55°
29
78°
54°
30
77°
53°
31
77°
53°
1
76°
54°
2
77°
52°
3
76°
52°
4
77°
53°
5
78°
58°
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 76° to 88°, with overnight lows between 52° and 67°. The average high for August is 82° with an average low of 60°. 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.
