South Dakota weather in May 2025

Expect 22°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in South Dakota in May. Check more long-term weather averages for South Dakota in May before you book your next holiday to South Dakota in 2025/2026.

  • 22°C maximum daytime temperature in May in South Dakota (Sioux Falls)22
    22°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in South Dakota (Sioux Falls)11
    11 days with some rainfall
  • 8°C minimum night-time temperature in May in South Dakota (Sioux Falls)8
    8°C min night temperature
  • 15 hours of daylight per day in May in South Dakota (Sioux Falls)15
    15 hours of daylight per day
  • No heat & humidity in May in South Dakota (Sioux Falls)0
    No heat & humidity
  • 79 mm monthly rainfall in May in South Dakota (Sioux Falls)79
    79 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in South Dakota (Sioux Falls)7
    7 (High) UV index

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The May weather guide for South Dakota (Sioux Falls) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top South Dakota destinations

Below are average maximum temperatures at popular destinations in South Dakota in May. Select a destination to see more weather parameters.

All South Dakota destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in South Dakota in May?

Daytime temperatures usually reach 22°C in Sioux Falls, South Dakota in May, falling to 8°C at night.

How sunny is it in South Dakota in May?

There are normally 9 hours of bright sunshine each day in Sioux Falls, South Dakota in May - that's 62% of daylight hours.

Does it rain in South Dakota in May?

There are usually 11 days with some rain in Sioux Falls, South Dakota in May and the average monthly rainfall is 79mm.

South Dakota May sunrise & sunset times

Browse the sunrise and sunset times for South Dakota in May 2025. Select a month to view South Dakota sunrise and sunset times for the next 12 months. The South Dakota sunrise and sunset times shown below are for Sioux Falls.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:19 19:30
Friday, 16th May 2025 05:01 19:47
Saturday, 31st May 2025 04:49 20:01

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