S
M
T
W
T
F
S
26
60°
39°
27
69°
37°
28
66°
39°
29
64°
41°
30
54°
45°
1
61°
39°
2
57°
43°
3
54°
38°
4
70°
39°
5
77°
49°
6
64°
51°
7
60°
41°
8
57°
43°
9
61°
45°
10
69°
49°
11
58°
45°
12
62°
38°
13
65°
45°
14
63°
48°
15
64°
47°
16
76°
45°
17
85°
55°
18
79°
57°
19
89°
68°
20
88°
45°
21
64°
41°
22
60°
42°
23
62°
48°
24
61°
50°
25
66°
49°
26
67°
51°
27
71°
48°
28
71°
50°
29
72°
53°
30
75°
48°
31
69°
51°
1
69°
50°
2
66°
49°
3
65°
48°
4
65°
53°
5
70°
53°
6
71°
52°
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 89°, with overnight lows between 41° and 68°. The average high for May is 71° with an average low of 51°. 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.
