S
M
T
W
T
F
S
26
70°
53°
27
66°
49°
28
66°
50°
29
67°
48°
30
66°
46°
1
67°
50°
2
68°
47°
3
67°
48°
4
69°
51°
5
77°
57°
6
78°
57°
7
75°
58°
8
79°
59°
9
80°
60°
10
80°
59°
11
73°
52°
12
68°
53°
13
70°
56°
14
71°
55°
15
71°
56°
16
70°
56°
17
70°
54°
18
80°
54°
19
74°
53°
20
76°
54°
21
74°
52°
22
73°
52°
23
74°
54°
24
75°
54°
25
73°
56°
26
75°
58°
27
76°
56°
28
77°
59°
29
77°
66°
30
84°
58°
31
85°
57°
1
77°
63°
2
82°
61°
3
86°
58°
4
80°
63°
5
85°
59°
6
79°
59°
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 86°, with overnight lows between 46° and 66°. The average high for May is 75° with an average low of 55°. 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.
