S
M
T
W
T
F
S
26
58°
46°
27
70°
45°
28
63°
50°
29
65°
53°
30
68°
46°
1
66°
49°
2
60°
43°
3
64°
45°
4
72°
55°
5
75°
54°
6
78°
61°
7
77°
55°
8
64°
50°
9
67°
50°
10
71°
53°
11
74°
52°
12
71°
55°
13
69°
54°
14
70°
59°
15
71°
58°
16
71°
56°
17
72°
59°
18
72°
62°
19
80°
62°
20
80°
61°
21
78°
63°
22
81°
63°
23
81°
62°
24
82°
63°
25
77°
60°
26
74°
63°
27
75°
64°
28
82°
65°
29
80°
64°
30
81°
64°
31
80°
65°
1
78°
59°
2
74°
58°
3
75°
58°
4
75°
58°
5
76°
59°
6
76°
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 60° to 82°, with overnight lows between 43° and 65°. The average high for May is 74° with an average low of 57°. 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.
