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
59°
44°
17
62°
41°
18
66°
46°
19
65°
51°
20
68°
50°
21
76°
49°
22
77°
51°
23
65°
51°
24
72°
50°
25
60°
50°
26
64°
51°
27
73°
55°
28
77°
53°
29
59°
47°
30
62°
47°
31
67°
50°
1
76°
54°
2
81°
54°
3
72°
55°
4
73°
53°
5
72°
52°
6
68°
54°
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 59° to 81°, with overnight lows between 47° and 55°. The average high for May is 70° 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.
