S
M
T
W
T
F
S
26
58°
32°
27
59°
32°
28
52°
34°
29
46°
42°
30
45°
42°
1
60°
38°
2
50°
42°
3
52°
34°
4
64°
44°
5
68°
52°
6
60°
51°
7
56°
45°
8
56°
40°
9
57°
41°
10
58°
43°
11
58°
45°
12
56°
42°
13
58°
43°
14
59°
43°
15
62°
44°
16
65°
48°
17
64°
47°
18
59°
49°
19
65°
49°
20
63°
48°
21
59°
49°
22
61°
50°
23
60°
48°
24
59°
47°
25
60°
48°
26
60°
50°
27
61°
49°
28
61°
47°
29
62°
47°
30
61°
50°
31
62°
52°
1
63°
50°
2
64°
48°
3
63°
53°
4
66°
53°
5
63°
52°
6
64°
54°
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 50° to 68°, with overnight lows between 34° and 54°. The average high for May is 61° with an average low of 47°. 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.
