S
M
T
W
T
F
S
26
66°
42°
27
73°
51°
28
71°
56°
29
61°
42°
30
55°
37°
1
53°
37°
2
52°
38°
3
53°
41°
4
61°
43°
5
63°
47°
6
64°
46°
7
63°
46°
8
62°
47°
9
64°
42°
10
65°
43°
11
65°
44°
12
69°
52°
13
68°
45°
14
64°
43°
15
63°
43°
16
64°
44°
17
64°
44°
18
66°
47°
19
74°
49°
20
69°
45°
21
67°
45°
22
68°
46°
23
67°
46°
24
73°
55°
25
77°
55°
26
71°
49°
27
68°
47°
28
69°
48°
29
72°
51°
30
77°
55°
31
79°
57°
1
79°
58°
2
80°
59°
3
81°
59°
4
81°
57°
5
75°
51°
6
74°
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 52° to 81°, with overnight lows between 37° and 59°. The average high for May is 68° 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.
