S
M
T
W
T
F
S
26
78°
54°
27
70°
60°
28
71°
59°
29
66°
51°
30
64°
42°
1
60°
43°
2
55°
39°
3
65°
52°
4
74°
58°
5
66°
49°
6
61°
44°
7
59°
44°
8
64°
50°
9
69°
51°
10
71°
52°
11
71°
55°
12
72°
54°
13
72°
53°
14
71°
56°
15
74°
60°
16
72°
58°
17
75°
61°
18
80°
62°
19
79°
62°
20
79°
63°
21
82°
63°
22
81°
62°
23
78°
60°
24
74°
58°
25
77°
63°
26
80°
64°
27
77°
62°
28
75°
62°
29
76°
59°
30
77°
60°
31
81°
64°
1
78°
64°
2
83°
66°
3
83°
61°
4
77°
57°
5
77°
58°
6
78°
58°
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 55° to 83°, with overnight lows between 39° and 66°. The average high for May is 74° with an average low of 57°. 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.
