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
84°
60°
5
88°
70°
6
78°
54°
7
75°
52°
8
84°
54°
9
87°
64°
10
80°
66°
11
82°
61°
12
80°
54°
13
87°
62°
14
90°
70°
15
94°
70°
16
86°
71°
17
86°
70°
18
87°
70°
19
85°
68°
20
82°
65°
21
81°
64°
22
86°
68°
23
88°
67°
24
87°
66°
25
82°
62°
26
84°
66°
27
83°
67°
28
82°
67°
29
84°
66°
30
85°
67°
31
83°
68°
1
86°
68°
2
87°
67°
3
82°
68°
4
83°
68°
5
85°
67°
6
85°
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 80° to 94°, with overnight lows between 54° and 71°. The average high for May is 85° with an average low of 67°. 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.
