S
M
T
W
T
F
S
29
35°
9°
30
37°
17°
31
32°
14°
1
26°
1°
2
32°
23°
3
40°
25°
4
33°
26°
5
43°
23°
6
32°
7°
7
36°
0°
8
34°
23°
9
37°
31°
10
44°
31°
11
47°
23°
12
43°
33°
13
53°
33°
14
44°
31°
15
51°
35°
16
54°
33°
17
53°
35°
18
35°
20°
19
38°
18°
20
41°
12°
21
64°
26°
22
57°
43°
23
51°
40°
24
44°
34°
25
51°
34°
26
47°
37°
27
42°
39°
28
43°
37°
29
41°
35°
30
42°
36°
1
43°
33°
2
44°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Isle Royale National Park
Isle Royale National Park's April 2026 forecast shows daily high temperatures ranging from 41° to 57°, with overnight lows between 33° and 43°. The average high for April is 46° with an average low of 37°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Isle Royale National Park. See also: May | June | July.
