S
M
T
W
T
F
S
26
82°
70°
27
87°
70°
28
89°
69°
29
90°
71°
30
90°
70°
31
89°
70°
1
89°
70°
2
85°
69°
3
86°
70°
4
89°
70°
5
88°
69°
6
89°
70°
7
87°
67°
8
90°
64°
9
87°
65°
10
89°
64°
11
85°
63°
12
87°
64°
13
89°
66°
14
90°
68°
15
89°
68°
16
84°
67°
17
84°
63°
18
85°
67°
19
86°
67°
20
84°
68°
21
86°
67°
22
83°
62°
23
88°
62°
24
88°
63°
25
89°
65°
26
89°
67°
27
87°
66°
28
86°
64°
29
86°
64°
30
87°
65°
31
86°
66°
1
82°
63°
2
81°
60°
3
81°
60°
4
82°
59°
5
81°
59°
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 81° to 90°, with overnight lows between 59° and 71°. The average high for August is 86° with an average low of 66°. 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.
