S
M
T
W
T
F
S
26
46°
41°
27
55°
39°
28
61°
45°
29
68°
48°
30
73°
52°
1
75°
57°
2
72°
55°
3
67°
47°
4
51°
44°
5
58°
44°
6
73°
52°
7
76°
51°
8
76°
53°
9
78°
58°
10
81°
60°
11
82°
61°
12
77°
56°
13
77°
56°
14
75°
55°
15
71°
43°
16
75°
49°
17
76°
50°
18
75°
49°
19
76°
50°
20
77°
50°
21
77°
49°
22
76°
50°
23
77°
51°
24
78°
51°
25
79°
50°
26
78°
51°
27
76°
50°
28
74°
49°
29
73°
49°
30
74°
50°
31
75°
52°
1
77°
52°
2
79°
51°
3
79°
52°
4
77°
51°
5
77°
51°
6
72°
47°
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 51° to 82°, with overnight lows between 43° and 61°. The average high for May is 75° with an average low of 51°. 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.
