S
M
T
W
T
F
S
26
79°
43°
27
75°
52°
28
63°
48°
29
59°
41°
30
59°
37°
1
57°
34°
2
59°
36°
3
75°
45°
4
84°
45°
5
59°
45°
6
57°
37°
7
68°
34°
8
72°
41°
9
77°
48°
10
70°
43°
11
72°
43°
12
81°
50°
13
73°
48°
14
77°
43°
15
82°
55°
16
84°
61°
17
86°
63°
18
75°
63°
19
66°
48°
20
66°
45°
21
68°
48°
22
68°
54°
23
75°
53°
24
83°
55°
25
85°
59°
26
86°
64°
27
77°
61°
28
81°
56°
29
80°
55°
30
74°
54°
31
75°
55°
1
76°
58°
2
79°
57°
3
80°
59°
4
83°
59°
5
79°
57°
6
80°
63°
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 86°, with overnight lows between 53° and 64°. The average high for May is 80° with an average low of 58°. 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.
