S
M
T
W
T
F
S
26
70°
50°
27
61°
45°
28
59°
43°
29
55°
33°
30
49°
26°
1
53°
32°
2
62°
28°
3
72°
47°
4
67°
41°
5
50°
35°
6
44°
30°
7
56°
29°
8
69°
30°
9
61°
43°
10
60°
33°
11
63°
27°
12
75°
47°
13
69°
45°
14
74°
34°
15
87°
52°
16
81°
53°
17
60°
52°
18
76°
53°
19
63°
49°
20
61°
40°
21
67°
39°
22
67°
50°
23
71°
50°
24
81°
44°
25
85°
53°
26
88°
61°
27
86°
49°
28
79°
50°
29
83°
51°
30
84°
52°
31
84°
54°
1
81°
53°
2
79°
55°
3
82°
56°
4
83°
59°
5
83°
61°
6
85°
62°
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 79° to 88°, with overnight lows between 49° and 62°. The average high for May is 83° with an average low of 55°. 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.
