S
M
T
W
T
F
S
26
65°
37°
27
72°
31°
28
68°
35°
29
65°
34°
30
52°
45°
1
60°
38°
2
55°
39°
3
52°
33°
4
71°
36°
5
83°
44°
6
66°
48°
7
59°
36°
8
57°
30°
9
50°
30°
10
71°
44°
11
60°
38°
12
62°
32°
13
56°
39°
14
57°
50°
15
60°
46°
16
80°
45°
17
87°
54°
18
91°
54°
19
92°
63°
20
79°
48°
21
61°
35°
22
66°
39°
23
61°
46°
24
54°
44°
25
63°
51°
26
72°
52°
27
74°
55°
28
73°
49°
29
72°
51°
30
72°
52°
31
73°
56°
1
74°
55°
2
76°
51°
3
73°
55°
4
74°
54°
5
74°
56°
6
73°
56°
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 54° to 79°, with overnight lows between 35° and 56°. The average high for May is 70° 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.
