S
M
T
W
T
F
S
26
58°
46°
27
70°
45°
28
63°
50°
29
62°
54°
30
70°
49°
1
67°
44°
2
63°
49°
3
64°
44°
4
75°
57°
5
86°
64°
6
77°
56°
7
66°
44°
8
64°
45°
9
62°
46°
10
69°
49°
11
70°
54°
12
69°
52°
13
72°
57°
14
74°
57°
15
78°
58°
16
79°
60°
17
80°
61°
18
81°
62°
19
80°
62°
20
81°
61°
21
80°
62°
22
78°
54°
23
72°
54°
24
72°
55°
25
73°
57°
26
74°
56°
27
74°
56°
28
75°
58°
29
76°
57°
30
75°
62°
31
78°
65°
1
81°
65°
2
76°
62°
3
77°
63°
4
82°
66°
5
82°
66°
6
85°
67°
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 86°, with overnight lows between 44° and 67°. The average high for May is 75° with an average low of 58°. 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.
