S
M
T
W
T
F
S
26
68°
48°
27
61°
46°
28
55°
39°
29
63°
36°
30
64°
37°
1
64°
34°
2
68°
30°
3
81°
52°
4
86°
46°
5
55°
45°
6
63°
41°
7
77°
41°
8
73°
50°
9
82°
41°
10
73°
50°
11
82°
46°
12
86°
54°
13
81°
43°
14
81°
54°
15
91°
63°
16
90°
63°
17
88°
59°
18
81°
52°
19
61°
46°
20
64°
41°
21
61°
52°
22
77°
59°
23
77°
50°
24
82°
48°
25
86°
61°
26
86°
59°
27
85°
63°
28
79°
64°
29
79°
63°
30
80°
63°
31
79°
59°
1
81°
58°
2
82°
58°
3
84°
60°
4
84°
60°
5
91°
65°
6
93°
67°
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 93°, with overnight lows between 58° and 67°. The average high for May is 83° with an average low of 62°. 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.
