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°
46°
13
77°
57°
14
63°
52°
15
72°
47°
16
84°
63°
17
88°
65°
18
95°
69°
19
97°
72°
20
93°
62°
21
70°
55°
22
71°
56°
23
75°
57°
24
76°
60°
25
82°
62°
26
83°
63°
27
81°
64°
28
79°
60°
29
75°
64°
30
80°
64°
31
80°
62°
1
76°
59°
2
76°
58°
3
75°
58°
4
76°
59°
5
79°
66°
6
86°
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 70° to 97°, with overnight lows between 47° and 72°. The average high for May is 80° with an average low of 61°. 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.
