S
M
T
W
T
F
S
26
44°
33°
27
43°
31°
28
53°
28°
29
58°
32°
30
60°
34°
1
63°
36°
2
66°
43°
3
69°
46°
4
59°
39°
5
55°
36°
6
64°
37°
7
72°
49°
8
73°
46°
9
72°
45°
10
80°
48°
11
84°
56°
12
82°
54°
13
75°
47°
14
73°
40°
15
70°
41°
16
63°
39°
17
43°
26°
18
53°
21°
19
61°
31°
20
68°
35°
21
71°
43°
22
71°
46°
23
74°
52°
24
78°
52°
25
75°
54°
26
61°
29°
27
39°
28°
28
44°
34°
29
44°
33°
30
54°
30°
31
59°
31°
1
68°
32°
2
70°
35°
3
74°
28°
4
76°
23°
5
74°
29°
6
73°
30°
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 39° to 76°, with overnight lows between 23° and 35°. The average high for May is 61° with an average low of 30°. 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.
