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Weather in Rapid City, South Dakota for May 2026

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

    Official Weather Alert ⚠️

  • Wind Advisory - See hour by hour.

    • Temperatures

  • Until now, May 2026 in Rapid City is cooler than usual, with temperatures averaging 17.8 °F, this is -3.1 °F below the typical seasonal average.

  • The forecast for the next days in Rapid City predicts temperatures to be around 22 °F, close to the historical average.

  • In general, the average temperature in Rapid City at the beginning of May is 17.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.4 °F by the end of May.

    • Rain 🌧️

  • The climate of Rapid City in May is notably wet, with an average of 11 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
20
Dry days
Average rainy days
11
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
15°
2
Sunny
20°
3
Sunny
21°
4
Sunny
20°
5
Patchy rain possible
16°
6
Patchy rain possible
14°
7
Overcast
18°
8
Overcast
22°
9
Cloudy
20°
10
Sunny
25°
11
Sunny
32°
12
Sunny
28°
13
Cloudy
26°
14
Weather Alert Sunny
27°
15
Sunny
26°
16
Sunny
24°
17
Moderate rain
16°
18
Sunny
18°
19
Partly cloudy
18°
20
Patchy rain possible
18°
21
Patchy rain possible
16°
22
Sunny
29°
23
Sunny
33°
24
Patchy rain possible
26°
25
Patchy rain possible
17°
26
Patchy rain possible
23°
27
Patchy rain possible
17°
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
 15° /3° 0.2 mm 6
May 2 Sunny
Sunny
 20° /3° 0 mm 7
May 3 Sunny
Sunny
 21° /7° 0.6 mm 7
May 4 Sunny
Sunny
 20° /8° 0.1 mm 8
May 5 Patchy rain possible
Patchy rain possible
 16° /6° 3.7 mm 6
May 6 Patchy rain possible
Patchy rain possible
 14° /2° 0.1 mm 7
May 7 Overcast
Overcast
 18° /4° 0.6 mm 7
May 8 Overcast
Overcast
 22° /7° 0 mm 7
May 9 Cloudy
Cloudy
 20° /11° 0 mm 7
May 10 Sunny
Sunny
 25° /9° 0 mm 9
May 11 Sunny
Sunny
 32° /12° 0.1 mm 9
May 12 Sunny
Sunny
 28° /14° 0.1 mm 9
May 13 Cloudy
Cloudy
 26° /18° 0.2 mm 6
May 14 Sunny
Sunny
 27° /12° 0 mm 6.2
May 15 Sunny
Sunny
 26° /10° 0 mm 0
May 16 Sunny
Sunny
 24° /7° 0.1 mm 5
May 17 Moderate rain
Moderate rain
 16° /9° 6.5 mm 3
May 18 Sunny
Sunny
 18° /5° 0 mm 3
May 19 Partly cloudy
Partly cloudy
 18° /6° 0 mm 4
May 20 Patchy rain possible
Patchy rain possible
 18° /8° 1.3 mm 3
May 21 Patchy rain possible
Patchy rain possible
 16° /4° 0.6 mm 2
May 22 Sunny
Sunny
 29° /4° 0 mm 5
May 23 Sunny
Sunny
 33° /15° 0 mm 6
May 24 Patchy rain possible
Patchy rain possible
 26° /13° 0.2 mm 5
May 25 Patchy rain possible
Patchy rain possible
 17° /7° 0.1 mm 3
May 26 Patchy rain possible
Patchy rain possible
 23° /12° 1.1 mm 3
May 27 Patchy rain possible
Patchy rain possible
 17° /9° 0.3 mm 3
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 11 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 💧
Typically, Rapid City has 11 rainy days in May with a total of 119.4 mm of rainfall.

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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