S
M
T
W
T
F
S
26
75°
44°
27
66°
42°
28
65°
42°
29
66°
43°
30
66°
42°
1
67°
42°
2
68°
47°
3
70°
46°
4
68°
50°
5
71°
50°
6
70°
49°
7
67°
49°
8
68°
48°
9
67°
45°
10
66°
47°
11
69°
46°
12
65°
44°
13
69°
44°
14
70°
47°
15
69°
47°
16
70°
46°
17
71°
48°
18
72°
47°
19
72°
47°
20
70°
46°
21
71°
47°
22
70°
47°
23
69°
46°
24
69°
47°
25
71°
44°
26
72°
44°
27
68°
42°
28
70°
43°
29
70°
44°
30
69°
43°
31
70°
42°
1
70°
39°
2
62°
40°
3
60°
38°
4
62°
43°
5
64°
43°
6
68°
42°
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 75°, with overnight lows between 38° and 50°. The average high for May is 68° with an average low of 45°. 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.
