S
M
T
W
T
F
S
26
66°
41°
27
59°
50°
28
57°
48°
29
59°
43°
30
61°
45°
1
63°
48°
2
66°
54°
3
68°
55°
4
75°
50°
5
63°
54°
6
59°
54°
7
63°
52°
8
59°
52°
9
64°
52°
10
66°
52°
11
61°
50°
12
68°
50°
13
63°
54°
14
61°
48°
15
55°
48°
16
57°
46°
17
63°
45°
18
64°
50°
19
64°
50°
20
64°
48°
21
66°
48°
22
72°
50°
23
63°
52°
24
64°
50°
25
61°
52°
26
61°
50°
27
68°
50°
28
73°
54°
29
64°
50°
30
66°
45°
31
66°
46°
1
74°
54°
2
78°
55°
3
72°
52°
4
68°
51°
5
65°
50°
6
62°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lummi Island
Lummi Island's May 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 45° and 55°. 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 Lummi Island. See also: June | July | August.
