S
M
T
W
T
F
S
26
63°
42°
27
69°
47°
28
69°
48°
29
64°
53°
30
56°
44°
1
51°
38°
2
48°
37°
3
51°
40°
4
55°
37°
5
66°
46°
6
56°
44°
7
52°
45°
8
52°
42°
9
65°
45°
10
57°
48°
11
53°
42°
12
53°
40°
13
54°
46°
14
53°
46°
15
65°
49°
16
54°
36°
17
54°
35°
18
46°
35°
19
45°
31°
20
44°
32°
21
44°
32°
22
49°
32°
23
52°
34°
24
51°
33°
25
52°
38°
26
54°
39°
27
57°
39°
28
58°
41°
29
60°
48°
30
48°
37°
31
43°
38°
1
42°
38°
2
42°
36°
3
43°
32°
4
42°
33°
5
44°
39°
6
44°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in William's Harbour
William's Harbour's May 2026 forecast shows daily high temperatures ranging from 42° to 60°, with overnight lows between 31° and 48°. The average high for May is 49° with an average low of 36°. 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 William's Harbour. See also: June | July | August.
