S
M
T
W
T
F
S
26
63°
40°
27
72°
37°
28
64°
38°
29
64°
47°
30
60°
47°
1
62°
44°
2
58°
37°
3
58°
38°
4
68°
45°
5
78°
57°
6
66°
49°
7
61°
36°
8
56°
35°
9
59°
43°
10
62°
44°
11
63°
45°
12
62°
46°
13
62°
46°
14
64°
45°
15
64°
46°
16
65°
48°
17
65°
46°
18
66°
51°
19
73°
52°
20
72°
52°
21
70°
51°
22
74°
50°
23
67°
49°
24
71°
48°
25
68°
46°
26
68°
50°
27
67°
53°
28
69°
55°
29
75°
54°
30
74°
53°
31
74°
51°
1
70°
47°
2
67°
48°
3
67°
48°
4
70°
49°
5
69°
49°
6
70°
50°
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 56° to 78°, with overnight lows between 35° and 57°. The average high for May is 67° 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.
