S
M
T
W
T
F
S
26
45°
19°
27
48°
27°
28
42°
21°
29
48°
26°
30
50°
26°
1
67°
25°
2
62°
32°
3
66°
31°
4
41°
27°
5
39°
27°
6
42°
22°
7
50°
30°
8
56°
30°
9
58°
32°
10
61°
34°
11
63°
38°
12
60°
36°
13
56°
35°
14
53°
36°
15
60°
36°
16
58°
41°
17
64°
40°
18
62°
43°
19
55°
38°
20
55°
32°
21
53°
31°
22
58°
36°
23
59°
36°
24
56°
33°
25
56°
33°
26
57°
34°
27
57°
33°
28
60°
38°
29
62°
42°
30
61°
43°
31
68°
45°
1
69°
47°
2
70°
46°
3
70°
47°
4
71°
48°
5
69°
47°
6
67°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rapid City
Rapid City's May 2026 forecast shows daily high temperatures ranging from 39° to 71°, with overnight lows between 22° and 48°. The average high for May is 59° 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 May weather will actually feel in Rapid City. See also: June | July | August.
