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
78°
46°
3
69°
52°
4
59°
34°
5
46°
30°
6
53°
36°
7
59°
45°
8
66°
46°
9
66°
47°
10
65°
45°
11
69°
48°
12
80°
52°
13
70°
45°
14
69°
48°
15
65°
43°
16
70°
50°
17
69°
49°
18
69°
50°
19
61°
49°
20
64°
50°
21
61°
42°
22
62°
48°
23
69°
52°
24
62°
44°
25
60°
42°
26
62°
45°
27
63°
51°
28
62°
50°
29
61°
49°
30
63°
45°
31
65°
50°
1
72°
55°
2
75°
54°
3
76°
56°
4
77°
57°
5
77°
58°
6
76°
58°
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 46° to 80°, with overnight lows between 30° and 58°. The average high for May is 66° with an average low of 48°. 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.
