S
M
T
W
T
F
S
26
68°
38°
27
60°
46°
28
53°
31°
29
46°
31°
30
40°
27°
1
44°
24°
2
58°
20°
3
69°
36°
4
63°
38°
5
44°
26°
6
40°
28°
7
50°
31°
8
62°
26°
9
53°
29°
10
47°
23°
11
54°
28°
12
65°
36°
13
59°
32°
14
69°
27°
15
82°
50°
16
77°
40°
17
55°
38°
18
77°
50°
19
63°
42°
20
56°
39°
21
62°
29°
22
67°
44°
23
68°
44°
24
74°
50°
25
82°
44°
26
87°
50°
27
80°
40°
28
75°
45°
29
85°
51°
30
74°
39°
31
78°
44°
1
83°
49°
2
80°
54°
3
77°
52°
4
77°
49°
5
78°
54°
6
76°
53°
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 74° to 87°, with overnight lows between 39° and 54°. The average high for May is 79° with an average low of 48°. 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.
