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
75°
56°
7
67°
48°
8
68°
55°
9
73°
50°
10
80°
59°
11
68°
46°
12
68°
50°
13
74°
60°
14
78°
58°
15
81°
60°
16
74°
57°
17
71°
56°
18
75°
58°
19
80°
57°
20
72°
54°
21
71°
55°
22
70°
55°
23
71°
56°
24
72°
54°
25
74°
57°
26
77°
61°
27
76°
59°
28
78°
60°
29
79°
57°
30
81°
64°
31
83°
65°
1
78°
65°
2
83°
64°
3
83°
65°
4
84°
66°
5
85°
66°
6
84°
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 67° to 85°, 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.
