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Weather in Rapid City, South Dakota for May 2026

Your guide to Rapid City weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Rapid City at the beginning of May is 19.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 18.3 °F by the end of May.

    • Rain 🌧️

  • The climate of Rapid City in May is notably wet, with an average of 12 rainy days, and a total of 119.4 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
19
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/9°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
61 %
Avg humidity

Rapid City Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
14°
2
Sunny
16°
3
Sunny
23°
4
Sunny
26°
5
Patchy rain possible
23°
6
Patchy rain possible
15°
7
Overcast
19°
8
Overcast
24°
9
Cloudy
26°
10
Sunny
30°
11
Sunny
33°
12
Sunny
33°
13
Cloudy
26°
14
Heavy rain at times
19°
15
Patchy rain possible
18°
16
Patchy rain possible
14°
17
Sunny
19°
18
Moderate or heavy rain shower
13°
19
Moderate or heavy rain shower
7°
20
Moderate rain at times
13°
21
Patchy rain possible
17°
22
Partly cloudy
18°
23
Patchy rain possible
15°
24
Moderate rain at times
11°
25
Moderate rain
10°
26
Moderate rain at times
10°
27
Thundery outbreaks possible
15°
28
Thundery outbreaks possible
18°
29
Sunny
21°
30
Sunny
27°
31
Sunny
27°

Temperatures trend during May in Rapid City

See the weather trend as well as the moving average line

May weather in Rapid City day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Patchy rain possible
Patchy rain possible
 14° /5° 0.3 mm 3
May 2 Sunny
Sunny
 16° /3° 0 mm 5
May 3 Sunny
Sunny
 23° /6° 0 mm 6
May 4 Sunny
Sunny
 26° /10° 0 mm 7
May 5 Patchy rain possible
Patchy rain possible
 23° /10° 7.3 mm 5
May 6 Patchy rain possible
Patchy rain possible
 15° /6° 0.1 mm 4
May 7 Overcast
Overcast
 19° /6° 0 mm 4
May 8 Overcast
Overcast
 24° /9° 0 mm 5
May 9 Cloudy
Cloudy
 26° /15° 0 mm 6
May 10 Sunny
Sunny
 30° /12° 0 mm 8
May 11 Sunny
Sunny
 33° /17° 0 mm 8
May 12 Sunny
Sunny
 33° /18° 0 mm 8
May 13 Cloudy
Cloudy
 26° /18° 0.2 mm 6
May 14 Heavy rain at times
Heavy rain at times
 19° /11° 12.1 mm 4
May 15 Patchy rain possible
Patchy rain possible
 18° /9° 0.2 mm 4
May 16 Patchy rain possible
Patchy rain possible
 14° /8° 4.4 mm 3
May 17 Sunny
Sunny
 19° /5° 0 mm 5
May 18 Moderate or heavy rain shower
Moderate or heavy rain shower
 13° /7° 6.9 mm 3
May 19 Moderate or heavy rain shower
Moderate or heavy rain shower
 7° /1° 25.9 mm 2
May 20 Moderate rain at times
Moderate rain at times
 13° /2° 2.6 mm 3
May 21 Patchy rain possible
Patchy rain possible
 17° /4° 0.1 mm 4
May 22 Partly cloudy
Partly cloudy
 18° /5° 0.1 mm 5
May 23 Patchy rain possible
Patchy rain possible
 15° /8° 3.8 mm 4
May 24 Moderate rain at times
Moderate rain at times
 11° /7° 3.7 mm 3
May 25 Moderate rain
Moderate rain
 10° /8° 35.3 mm 3
May 26 Moderate rain at times
Moderate rain at times
 10° /8° 15.4 mm 3
May 27 Thundery outbreaks possible
Thundery outbreaks possible
 15° /8° 1 mm 4
May 28 Thundery outbreaks possible
Thundery outbreaks possible
 18° /10° 0 mm 4
May 29 Sunny
Sunny
 21° /9° 0 mm 6
May 30 Sunny
Sunny
 27° /12° 0 mm 7
May 31 Sunny
Sunny
 27° /15° 0 mm 7
Next
Important Notice
Our weather forecast for Rapid City in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rapid City forecast closer to your planned date for the most up-to-date weather information.
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Rapid City in May - FAQ

What are the expected maximum and minimum temperatures in Rapid City during May?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Rapid City during May?
Significant rainfall exceeding 119.4 mm is expected in Rapid City during May, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rapid City during May?
The average wind speed in Rapid City during May is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Rapid City

Explore the daily rainfall trends and prepare for Rapid Citys May weather 💧

UV exposure in Rapid City during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is Rapid City?

Get accurate weather forecasts for Rapid City, located at latitude 44.081 and longitude -103.231. Stay updated with localized weather information tailored for Rapid City.

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