S
M
T
W
T
F
S
26
68°
43°
27
57°
47°
28
56°
46°
29
66°
47°
30
75°
48°
1
72°
52°
2
74°
49°
3
81°
56°
4
77°
53°
5
63°
52°
6
57°
51°
7
64°
50°
8
62°
49°
9
69°
48°
10
66°
48°
11
72°
51°
12
82°
52°
13
58°
51°
14
60°
46°
15
51°
44°
16
54°
42°
17
62°
45°
18
69°
49°
19
69°
48°
20
73°
51°
21
77°
54°
22
71°
49°
23
70°
50°
24
68°
49°
25
65°
49°
26
67°
48°
27
68°
51°
28
62°
50°
29
63°
46°
30
66°
46°
31
71°
51°
1
71°
53°
2
64°
52°
3
63°
48°
4
63°
47°
5
64°
49°
6
63°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Vashon
Vashon's May 2026 forecast shows daily high temperatures ranging from 51° to 77°, with overnight lows between 42° and 54°. The average high for May is 66° with an average low of 49°. 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 Vashon. See also: June | July | August.
