S
M
T
W
T
F
S
26
51°
41°
27
52°
39°
28
53°
40°
29
53°
45°
30
54°
45°
1
58°
44°
2
56°
41°
3
53°
40°
4
53°
41°
5
54°
41°
6
53°
42°
7
54°
41°
8
54°
41°
9
58°
45°
10
60°
47°
11
60°
48°
12
61°
45°
13
57°
44°
14
56°
47°
15
57°
46°
16
55°
44°
17
56°
43°
18
55°
43°
19
55°
44°
20
56°
43°
21
56°
44°
22
60°
46°
23
59°
43°
24
60°
49°
25
63°
49°
26
62°
47°
27
64°
49°
28
62°
50°
29
64°
50°
30
63°
49°
31
64°
50°
1
62°
50°
2
64°
44°
3
63°
46°
4
64°
50°
5
65°
51°
6
64°
48°
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 51° to 65°, with overnight lows between 39° and 51°. The average high for May is 58° with an average low of 45°. 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.
