S
M
T
W
T
F
S
26
66°
51°
27
64°
49°
28
58°
43°
29
57°
46°
30
56°
41°
1
48°
40°
2
52°
40°
3
54°
43°
4
59°
47°
5
65°
46°
6
59°
46°
7
60°
44°
8
58°
42°
9
60°
43°
10
59°
44°
11
61°
53°
12
67°
53°
13
68°
51°
14
61°
49°
15
61°
45°
16
60°
45°
17
61°
48°
18
61°
46°
19
62°
46°
20
62°
47°
21
63°
46°
22
65°
56°
23
68°
52°
24
68°
47°
25
63°
47°
26
64°
48°
27
65°
51°
28
66°
52°
29
67°
55°
30
67°
56°
31
68°
56°
1
68°
55°
2
71°
57°
3
75°
59°
4
77°
59°
5
81°
60°
6
73°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Indiana Dunes State Park
Indiana Dunes State Park's May 2026 forecast shows daily high temperatures ranging from 48° to 81°, with overnight lows between 40° and 62°. The average high for May is 64° with an average low of 49°. 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 Indiana Dunes State Park. See also: June | July | August.
