S
M
T
W
T
F
S
26
68°
40°
27
60°
49°
28
59°
48°
29
66°
48°
30
74°
47°
1
71°
50°
2
74°
52°
3
82°
52°
4
83°
53°
5
75°
53°
6
72°
49°
7
66°
48°
8
61°
50°
9
66°
50°
10
72°
52°
11
71°
51°
12
71°
51°
13
71°
50°
14
73°
51°
15
71°
50°
16
64°
46°
17
64°
46°
18
58°
45°
19
58°
43°
20
59°
43°
21
68°
50°
22
68°
49°
23
64°
46°
24
69°
51°
25
69°
49°
26
66°
48°
27
69°
52°
28
70°
52°
29
71°
51°
30
71°
52°
31
72°
53°
1
72°
53°
2
70°
52°
3
71°
53°
4
70°
50°
5
70°
50°
6
69°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sammamish
Sammamish's May 2026 forecast shows daily high temperatures ranging from 58° to 83°, with overnight lows between 43° and 53°. The average high for May is 69° with an average low of 50°. 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 Sammamish. See also: June | July | August.
