S
M
T
W
T
F
S
26
58°
46°
27
70°
45°
28
63°
51°
29
65°
50°
30
66°
44°
1
63°
47°
2
56°
43°
3
60°
43°
4
67°
49°
5
72°
53°
6
72°
53°
7
71°
54°
8
71°
53°
9
64°
50°
10
68°
52°
11
67°
55°
12
71°
59°
13
73°
55°
14
70°
54°
15
69°
53°
16
68°
52°
17
68°
52°
18
71°
53°
19
75°
61°
20
77°
56°
21
73°
55°
22
72°
54°
23
72°
54°
24
74°
61°
25
81°
63°
26
79°
57°
27
74°
55°
28
73°
56°
29
75°
57°
30
78°
62°
31
83°
64°
1
83°
65°
2
84°
66°
3
85°
67°
4
85°
66°
5
84°
60°
6
77°
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 56° to 85°, with overnight lows between 43° and 67°. The average high for May is 72° 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.
