S
M
T
W
T
F
S
26
86°
72°
27
88°
72°
28
89°
71°
29
86°
68°
30
73°
64°
1
64°
52°
2
71°
51°
3
76°
48°
4
76°
52°
5
79°
62°
6
84°
66°
7
73°
58°
8
69°
62°
9
72°
64°
10
85°
64°
11
81°
67°
12
82°
64°
13
83°
61°
14
86°
63°
15
86°
67°
16
85°
68°
17
87°
71°
18
89°
74°
19
89°
68°
20
83°
68°
21
79°
70°
22
86°
71°
23
75°
67°
24
80°
67°
25
85°
69°
26
85°
72°
27
82°
70°
28
85°
69°
29
87°
70°
30
86°
71°
31
84°
69°
1
84°
67°
2
82°
65°
3
81°
66°
4
83°
66°
5
83°
68°
6
85°
69°
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 81° to 87°, with overnight lows between 65° and 72°. The average high for May is 84° with an average low of 69°. 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.
