S
M
T
W
T
F
S
26
58°
46°
27
70°
45°
28
63°
50°
29
62°
54°
30
70°
49°
1
67°
44°
2
63°
49°
3
64°
44°
4
77°
51°
5
86°
61°
6
71°
59°
7
63°
51°
8
74°
48°
9
76°
59°
10
82°
55°
11
64°
49°
12
71°
54°
13
75°
54°
14
66°
49°
15
72°
52°
16
85°
65°
17
90°
65°
18
92°
69°
19
94°
65°
20
83°
64°
21
83°
62°
22
81°
63°
23
80°
62°
24
81°
64°
25
82°
59°
26
83°
64°
27
84°
65°
28
84°
65°
29
83°
64°
30
84°
66°
31
85°
65°
1
84°
63°
2
77°
60°
3
77°
62°
4
80°
66°
5
78°
66°
6
84°
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 66° to 94°, with overnight lows between 49° and 69°. The average high for May is 81° 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.
