S
M
T
W
T
F
S
26
41°
34°
27
49°
34°
28
53°
38°
29
42°
34°
30
40°
33°
1
41°
28°
2
46°
36°
3
54°
39°
4
47°
32°
5
43°
32°
6
39°
33°
7
43°
32°
8
44°
34°
9
47°
36°
10
48°
37°
11
49°
38°
12
49°
36°
13
50°
38°
14
55°
36°
15
48°
40°
16
49°
39°
17
49°
41°
18
50°
40°
19
51°
42°
20
53°
42°
21
51°
40°
22
49°
35°
23
48°
37°
24
50°
41°
25
52°
40°
26
53°
43°
27
52°
43°
28
51°
40°
29
52°
42°
30
53°
40°
31
52°
40°
1
52°
41°
2
53°
39°
3
53°
44°
4
54°
43°
5
53°
44°
6
54°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grand Marais
Grand Marais's May 2026 forecast shows daily high temperatures ranging from 39° to 55°, with overnight lows between 28° and 44°. The average high for May is 50° with an average low of 39°. 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 Grand Marais. See also: June | July | August.
