S
M
T
W
T
F
S
26
90°
67°
27
90°
74°
28
89°
72°
29
74°
62°
30
68°
58°
1
69°
54°
2
81°
52°
3
85°
51°
4
83°
66°
5
83°
72°
6
74°
55°
7
69°
52°
8
78°
59°
9
80°
62°
10
79°
61°
11
81°
61°
12
85°
62°
13
87°
66°
14
86°
62°
15
84°
64°
16
86°
66°
17
81°
60°
18
76°
64°
19
79°
64°
20
81°
63°
21
83°
58°
22
77°
57°
23
77°
58°
24
78°
61°
25
77°
59°
26
77°
58°
27
78°
59°
28
79°
60°
29
80°
64°
30
81°
66°
31
80°
67°
1
81°
67°
2
82°
65°
3
83°
68°
4
83°
68°
5
82°
67°
6
80°
68°
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 69° to 87°, with overnight lows between 52° and 72°. The average high for May is 80° with an average low of 63°. 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.
