S
M
T
W
T
F
S
26
61°
36°
27
59°
43°
28
50°
36°
29
57°
32°
30
61°
32°
1
73°
32°
2
64°
48°
3
50°
45°
4
61°
43°
5
50°
34°
6
50°
30°
7
57°
30°
8
61°
45°
9
48°
34°
10
55°
32°
11
46°
34°
12
57°
39°
13
52°
37°
14
52°
36°
15
52°
36°
16
57°
34°
17
59°
43°
18
59°
41°
19
61°
48°
20
61°
50°
21
64°
54°
22
75°
52°
23
68°
54°
24
75°
46°
25
82°
55°
26
68°
50°
27
61°
47°
28
70°
54°
29
71°
52°
30
69°
55°
31
68°
50°
1
65°
51°
2
64°
50°
3
65°
50°
4
64°
49°
5
65°
50°
6
60°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Washington
Washington's May 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 46° and 55°. The average high for May is 68° with an average low of 50°. 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 Washington. See also: June | July | August.
