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°
62°
6
76°
55°
7
60°
47°
8
68°
50°
9
73°
54°
10
80°
62°
11
69°
50°
12
68°
46°
13
72°
54°
14
76°
58°
15
79°
60°
16
80°
61°
17
81°
59°
18
75°
57°
19
80°
62°
20
81°
61°
21
80°
62°
22
78°
54°
23
72°
54°
24
72°
55°
25
73°
57°
26
74°
56°
27
74°
56°
28
75°
58°
29
76°
57°
30
75°
62°
31
78°
65°
1
81°
65°
2
76°
62°
3
77°
63°
4
82°
66°
5
82°
66°
6
85°
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 60° to 86°, with overnight lows between 46° and 67°. The average high for May is 76° 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.
