S
M
T
W
T
F
S
26
64°
51°
27
71°
47°
28
74°
46°
29
78°
50°
30
80°
52°
1
80°
58°
2
86°
53°
3
87°
57°
4
79°
61°
5
74°
51°
6
83°
54°
7
89°
55°
8
95°
58°
9
96°
61°
10
95°
63°
11
100°
63°
12
101°
65°
13
95°
76°
14
96°
63°
15
98°
70°
16
92°
66°
17
86°
53°
18
80°
56°
19
84°
56°
20
89°
59°
21
92°
60°
22
96°
64°
23
94°
64°
24
95°
64°
25
96°
62°
26
98°
63°
27
90°
59°
28
82°
55°
29
83°
55°
30
86°
57°
31
91°
60°
1
95°
63°
2
95°
66°
3
96°
67°
4
96°
64°
5
88°
61°
6
91°
64°
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 80° to 98°, with overnight lows between 53° and 70°. The average high for May is 91° with an average low of 61°. 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.
