Sioux City weather in May 2025

Expect 23°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Sioux City in May. Check more long-term weather averages for Sioux City in May before you book your next holiday to Iowa in 2025/2026.

  • 23°C maximum daytime temperature in May in Sioux City23
    23°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Sioux City11
    11 days with some rainfall
  • 10°C minimum night-time temperature in May in Sioux City10
    10°C min night temperature
  • 15 hours of daylight per day in May in Sioux City15
    15 hours of daylight per day
  • No heat & humidity in May in Sioux City0
    No heat & humidity
  • 93 mm monthly rainfall in May in Sioux City93
    93 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Sioux City7
    7 (High) UV index

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The May weather guide for Iowa (Sioux City) 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.

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

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How hot is it in Sioux City in May?

Daytime temperatures usually reach 23°C in Sioux City in May, falling to 10°C at night.

How sunny is it in Sioux City in May?

There are normally 9 hours of bright sunshine each day in Sioux City in May - that's 60% of daylight hours.

Does it rain in Sioux City in May?

There are usually 11 days with some rain in Sioux City in May and the average monthly rainfall is 93mm.

Sioux City May sunrise & sunset times

Browse the sunrise and sunset times for Sioux City in May 2025. Select a month to view Sioux City sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:20 19:26
Friday, 16th May 2025 05:02 19:42
Saturday, 31st May 2025 04:51 19:56

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