S
M
T
W
T
F
S
26
86°
72°
27
86°
76°
28
89°
75°
29
85°
65°
30
73°
64°
1
64°
52°
2
74°
49°
3
78°
50°
4
81°
56°
5
85°
68°
6
82°
63°
7
73°
59°
8
79°
62°
9
89°
71°
10
89°
65°
11
78°
64°
12
82°
63°
13
89°
64°
14
91°
69°
15
89°
70°
16
87°
74°
17
90°
76°
18
89°
73°
19
87°
70°
20
85°
71°
21
86°
70°
22
86°
69°
23
85°
66°
24
87°
67°
25
87°
71°
26
88°
67°
27
88°
71°
28
89°
70°
29
90°
71°
30
87°
70°
31
84°
70°
1
85°
69°
2
86°
71°
3
87°
71°
4
87°
72°
5
85°
71°
6
85°
72°
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 84° to 91°, with overnight lows between 64° and 76°. The average high for May is 87° with an average low of 70°. 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.
