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
69°
31°
3
75°
28°
4
46°
32°
5
35°
27°
6
51°
23°
7
58°
15°
8
64°
33°
9
55°
24°
10
57°
18°
11
74°
32°
12
64°
41°
13
73°
50°
14
70°
46°
15
58°
33°
16
55°
33°
17
45°
33°
18
47°
31°
19
54°
35°
20
59°
36°
21
60°
38°
22
61°
41°
23
64°
43°
24
63°
42°
25
65°
39°
26
57°
44°
27
57°
43°
28
55°
38°
29
55°
36°
30
56°
35°
31
58°
36°
1
59°
44°
2
59°
44°
3
60°
43°
4
64°
46°
5
61°
42°
6
64°
47°
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 45° to 73°, with overnight lows between 31° and 50°. The average high for May is 59° with an average low of 40°. 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.
