S
M
T
W
T
F
S
26
55°
39°
27
70°
37°
28
66°
50°
29
59°
48°
30
50°
34°
1
54°
30°
2
46°
36°
3
57°
28°
4
72°
41°
5
73°
59°
6
57°
46°
7
59°
32°
8
61°
34°
9
64°
46°
10
63°
37°
11
63°
32°
12
68°
32°
13
66°
46°
14
46°
43°
15
67°
44°
16
77°
61°
17
80°
58°
18
91°
64°
19
90°
63°
20
74°
46°
21
65°
46°
22
68°
48°
23
74°
53°
24
77°
56°
25
75°
55°
26
76°
59°
27
75°
56°
28
76°
50°
29
71°
55°
30
74°
54°
31
69°
51°
1
69°
47°
2
70°
46°
3
68°
46°
4
70°
47°
5
76°
56°
6
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Indiana
Indiana's May 2026 forecast shows daily high temperatures ranging from 65° to 91°, with overnight lows between 44° and 64°. The average high for May is 74° with an average low of 53°. 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. See also: June | July | August.
