S
M
T
W
T
F
S
26
54°
34°
27
56°
40°
28
58°
46°
29
65°
49°
30
68°
46°
1
57°
44°
2
56°
42°
3
57°
38°
4
59°
43°
5
58°
46°
6
59°
49°
7
69°
48°
8
61°
44°
9
59°
41°
10
60°
47°
11
60°
47°
12
67°
50°
13
66°
51°
14
67°
51°
15
72°
52°
16
72°
52°
17
69°
48°
18
62°
44°
19
63°
50°
20
66°
53°
21
66°
54°
22
69°
45°
23
68°
48°
24
70°
49°
25
71°
50°
26
73°
54°
27
76°
53°
28
77°
54°
29
78°
51°
30
80°
51°
31
80°
59°
1
81°
55°
2
80°
53°
3
75°
60°
4
79°
61°
5
82°
61°
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 54° to 82°, with overnight lows between 34° and 61°. The average high for May is 68° with an average low of 49°. 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.
