S
M
T
W
T
F
S
26
75°
56°
27
74°
55°
28
75°
57°
29
75°
54°
30
74°
57°
31
76°
57°
1
77°
56°
2
75°
54°
3
71°
51°
4
70°
51°
5
73°
52°
6
71°
51°
7
70°
51°
8
73°
50°
9
72°
49°
10
74°
52°
11
73°
56°
12
73°
56°
13
72°
55°
14
75°
56°
15
72°
52°
16
73°
55°
17
74°
53°
18
71°
54°
19
69°
52°
20
70°
54°
21
74°
54°
22
74°
53°
23
71°
52°
24
69°
53°
25
68°
54°
26
68°
51°
27
69°
52°
28
68°
52°
29
70°
53°
30
72°
53°
31
73°
52°
1
71°
52°
2
70°
51°
3
71°
52°
4
71°
49°
5
70°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Heathrow
Heathrow's August 2026 forecast shows daily high temperatures ranging from 68° to 77°, with overnight lows between 48° and 57°. The average high for August is 72° with an average low of 53°. 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 Heathrow. See also: September | October | November.
