S
M
T
W
T
F
S
26
88°
70°
27
89°
67°
28
88°
67°
29
89°
68°
30
91°
67°
31
92°
72°
1
94°
70°
2
91°
70°
3
89°
68°
4
89°
66°
5
88°
69°
6
88°
68°
7
89°
68°
8
87°
70°
9
88°
71°
10
88°
71°
11
88°
70°
12
89°
69°
13
90°
72°
14
93°
66°
15
90°
66°
16
89°
69°
17
93°
71°
18
93°
70°
19
92°
68°
20
88°
66°
21
87°
65°
22
89°
66°
23
91°
69°
24
90°
70°
25
87°
70°
26
91°
69°
27
92°
70°
28
92°
70°
29
91°
69°
30
92°
63°
31
89°
64°
1
87°
68°
2
90°
68°
3
90°
67°
4
89°
68°
5
89°
67°
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 87° to 94°, with overnight lows between 63° and 72°. The average high for August is 90° with an average low of 68°. 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.
