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Weather in South Dakota for May 2026

Your guide to South Dakota weather in May - trends and predictions

    Official Weather Alert ⚠️

  • Red Flag Warning - See hour by hour.

    • Snow Forecast ❄️

  • Snowfall in South Dakota during May is quite rare, with fewer than 2 snowy days on average.
    According to South Dakota snow forecast for May 2026, no snow is expected in the next 2 weeks.

    • Temperatures

  • Until now, May 2026 in South Dakota is cooler than usual, with temperatures averaging 17.6 °F, this is -2.8 °F below the typical seasonal average.

  • The forecast for the next days in South Dakota predicts temperatures to be around 20 °F, close to the historical average.

  • In general, the average temperature in South Dakota at the beginning of May is 18.1 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 20.4 °F by the end of May.

    • Rain 🌧️

  • The climate of South Dakota in May is notably wet, with an average of 13 rainy days, and a total of 118.5 mm of precipitation.

    • More

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

Average dry days
17
Dry days
Average rainy days
13
Rainy days
Average snowy days
1
Snow days
Average temperatures
21°/10°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
67 %
Avg humidity

South Dakota Weather May

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

What’s the Weather Like in South Dakota This May?

Discover the average temperatures and weather trends across South Dakota’s cities this May.
Patchy rain possibleSioux Falls21 °F / 10 °FPatchy rain possibleRapid City19 °F / 9 °FSunnyAberdeen21 °F / 9 °FMore Locations

Temperatures trend during May in South Dakota

See the weather trend as well as the moving average line

May weather in South Dakota day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Overcast
Overcast
 17° /6° 0 mm 5
May 2 Patchy rain possible
Patchy rain possible
 16° /4° 4.2 mm 5
May 3 Overcast
Overcast
 18° /6° 1.4 mm 6
May 4 Patchy rain possible
Patchy rain possible
 19° /7° 1.6 mm 6
May 5 Sunny
Sunny
 18° /5° 0 mm 7
May 6 Overcast
Overcast
 19° /6° 6.6 mm 6
May 7 Thundery outbreaks possible
Thundery outbreaks possible
 20° /7° 0 mm 6
May 8 Light rain shower
Light rain shower
 21° /7° 1.5 mm 6
May 9 Light rain shower
Light rain shower
 21° /9° 1.2 mm 7
May 10 Patchy light drizzle
Patchy light drizzle
 23° /9° 0.1 mm 7
May 11 Partly cloudy
Partly cloudy
 27° /9° 0.1 mm 8
May 12 Thundery outbreaks possible
Thundery outbreaks possible
 26° /13° 1.1 mm 8
May 13 Patchy rain possible
Patchy rain possible
 26° /12° 0.7 mm 6
May 14 Patchy rain possible
Patchy rain possible
 29° /13° 1.1 mm 7.8
May 15 Patchy rain possible
Patchy rain possible
 27° /14° 0.6 mm 0.2
May 16 Sunny
Sunny
 26° /14° 0 mm 6
May 17 Heavy rain
Heavy rain
 23° /14° 25.6 mm 4
May 18 Moderate rain
Moderate rain
 19° /11° 5.4 mm 3
May 19 Patchy rain possible
Patchy rain possible
 15° /7° 0.2 mm 3
May 20 Patchy rain possible
Patchy rain possible
 23° /7° 0.2 mm 3
May 21 Sunny
Sunny
 18° /8° 0 mm 4
May 22 Patchy rain possible
Patchy rain possible
 27° /12° 0.1 mm 4
May 23 Moderate rain
Moderate rain
 14° /13° 5.9 mm 3
May 24 Patchy rain possible
Patchy rain possible
 12° /8° 0.6 mm 2
May 25 Patchy rain possible
Patchy rain possible
 13° /8° 0.4 mm 3
May 26 Patchy rain possible
Patchy rain possible
 15° /7° 0.1 mm 3
May 27 Sunny
Sunny
 21° /6° 0 mm 4
May 28 Partly cloudy
Partly cloudy
 21° /9° 0.2 mm 5
May 29 Moderate rain at times
Moderate rain at times
 22° /11° 0.7 mm 5
May 30 Heavy rain at times
Heavy rain at times
 25° /14° 4.1 mm 6
May 31 Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /15° 7.6 mm 6
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Important Notice
Our weather forecast for South Dakota 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 South Dakota forecast closer to your planned date for the most up-to-date weather information.
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South Dakota in May - FAQ

What are the expected maximum and minimum temperatures in South Dakota during May?

Enjoy moderate daytime temperatures of up to 21° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in South Dakota during May?

Significant rainfall exceeding 118.5 mm is expected in South Dakota during May, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.

Will it snow in South Dakota in May 2026?

South Dakota typically sees 6.23 cm of snowfall during May.

What are the typical wind conditions in South Dakota during May?

The average wind speed in South Dakota during May is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in South Dakota

Explore the daily rainfall trends and prepare for South Dakotas May weather 💧
Typically, South Dakota has 13 rainy days in May with a total of 118.5 mm of rainfall.

UV exposure in South Dakota during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Counties in South Dakota
Select a county for an accurate weather forecast
Brown CountyMinnehaha CountyPennington County
Top locations in South Dakota
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AberdeenRapid CitySioux Falls
More Locations

Quick links

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Location coordinates Where is South Dakota?

Get accurate weather forecasts for South Dakota, located at latitude 43.55 and longitude -96.7. Stay updated with localized weather information tailored for South Dakota.

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