S
M
T
W
T
F
S
26
63°
52°
27
67°
43°
28
73°
39°
29
74°
51°
30
71°
53°
1
61°
50°
2
56°
51°
3
66°
44°
4
78°
44°
5
81°
56°
6
83°
58°
7
73°
52°
8
72°
49°
9
76°
53°
10
84°
62°
11
74°
49°
12
71°
44°
13
78°
59°
14
74°
48°
15
75°
52°
16
88°
62°
17
92°
66°
18
89°
67°
19
89°
66°
20
88°
67°
21
80°
61°
22
79°
59°
23
81°
63°
24
80°
62°
25
77°
63°
26
81°
62°
27
83°
67°
28
82°
66°
29
83°
67°
30
83°
67°
31
82°
66°
1
79°
66°
2
79°
65°
3
80°
64°
4
78°
62°
5
79°
67°
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 74° to 92°, with overnight lows between 48° and 69°. The average high for May is 82° 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.
