S
M
T
W
T
F
S
26
66°
45°
27
70°
46°
28
63°
46°
29
64°
46°
30
70°
52°
1
75°
46°
2
72°
50°
3
N/A
4
66°
49°
5
63°
46°
6
59°
43°
7
62°
47°
8
64°
50°
9
66°
50°
10
62°
46°
11
63°
49°
12
62°
49°
13
62°
49°
14
62°
48°
15
61°
47°
16
59°
47°
17
60°
43°
18
61°
42°
19
60°
46°
20
60°
43°
21
59°
42°
22
60°
42°
23
61°
44°
24
62°
48°
25
62°
49°
26
63°
49°
27
63°
47°
28
62°
44°
29
62°
44°
30
63°
46°
31
68°
49°
1
68°
48°
2
67°
50°
3
68°
48°
4
64°
49°
5
66°
50°
6
68°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Heathrow
Heathrow's May 2026 forecast shows daily high temperatures ranging from 59° to 68°, with overnight lows between 42° and 52°. The average high for May is 63° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Heathrow. See also: June | July | August.
