S
M
T
W
T
F
S
26
53°
45°
27
70°
39°
28
67°
51°
29
64°
51°
30
65°
40°
1
68°
38°
2
59°
43°
3
63°
38°
4
76°
44°
5
87°
62°
6
77°
54°
7
61°
42°
8
68°
43°
9
72°
47°
10
77°
56°
11
68°
42°
12
64°
42°
13
68°
46°
14
74°
53°
15
78°
54°
16
79°
55°
17
79°
54°
18
73°
51°
19
76°
54°
20
77°
56°
21
77°
55°
22
74°
47°
23
68°
47°
24
68°
48°
25
69°
50°
26
71°
50°
27
70°
49°
28
70°
50°
29
71°
50°
30
71°
54°
31
76°
58°
1
78°
58°
2
73°
55°
3
74°
55°
4
79°
59°
5
79°
59°
6
81°
60°
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 61° to 87°, with overnight lows between 42° and 62°. The average high for May is 74° with an average low of 52°. 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.
