S
M
T
W
T
F
S
26
62°
42°
27
64°
43°
28
63°
45°
29
68°
46°
30
63°
48°
1
65°
44°
2
63°
47°
3
65°
45°
4
63°
42°
5
63°
50°
6
66°
54°
7
75°
52°
8
70°
50°
9
65°
51°
10
67°
46°
11
65°
45°
12
64°
44°
13
66°
46°
14
67°
49°
15
66°
47°
16
69°
56°
17
77°
51°
18
68°
47°
19
68°
49°
20
69°
51°
21
73°
58°
22
78°
59°
23
78°
58°
24
74°
56°
25
75°
60°
26
80°
60°
27
81°
56°
28
71°
53°
29
83°
57°
30
82°
56°
31
80°
55°
1
82°
56°
2
83°
56°
3
82°
58°
4
81°
61°
5
81°
61°
6
78°
62°
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 62° to 83°, with overnight lows between 42° and 62°. The average high for May is 72° with an average low of 52°. 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.
