S
M
T
W
T
F
S
26
42°
33°
27
43°
32°
28
52°
35°
29
59°
31°
30
59°
27°
1
61°
34°
2
80°
39°
3
67°
46°
4
57°
42°
5
51°
32°
6
55°
25°
7
65°
32°
8
73°
39°
9
63°
43°
10
73°
43°
11
92°
46°
12
75°
50°
13
93°
47°
14
82°
44°
15
77°
47°
16
78°
45°
17
60°
45°
18
46°
37°
19
58°
38°
20
68°
38°
21
70°
42°
22
N/A
23
71°
51°
24
83°
56°
25
87°
61°
26
88°
59°
27
78°
60°
28
71°
56°
29
74°
56°
30
73°
54°
31
77°
58°
1
75°
55°
2
74°
55°
3
71°
54°
4
74°
51°
5
67°
56°
6
73°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Rapid City
Rapid City's May 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 51° and 61°. The average high for May is 76° with an average low of 56°. 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.
