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
62°
48°
15
51°
45°
16
58°
44°
17
64°
49°
18
67°
50°
19
66°
53°
20
70°
51°
21
68°
52°
22
67°
50°
23
68°
51°
24
71°
50°
25
64°
50°
26
65°
50°
27
66°
51°
28
65°
51°
29
68°
52°
30
63°
48°
31
64°
49°
1
71°
55°
2
74°
57°
3
74°
57°
4
72°
56°
5
70°
52°
6
72°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Seattle
Seattle's May 2026 forecast shows daily high temperatures ranging from 58° to 74°, with overnight lows between 44° and 57°. The average high for May is 68° with an average low of 52°. 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 Seattle. See also: June | July | August.
