Sioux City weather in August 2025

Expect 29°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Sioux City in August. Check more long-term weather averages for Sioux City in August before you book your next holiday to Iowa in 2025/2026.

  • 29°C maximum daytime temperature in August in Sioux City29
    29°C max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in August in Sioux City9
    9 days with some rainfall
  • 16°C minimum night-time temperature in August in Sioux City16
    16°C min night temperature
  • 14 hours of daylight per day in August in Sioux City14
    14 hours of daylight per day
  • Moderate heat & humidity in August in Sioux CityM
    Moderate heat & humidity
  • 75 mm monthly rainfall in August in Sioux City75
    75 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Sioux City8
    8 (Very High) UV index

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Recommended for Iowa

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

The August 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 August?

Daytime temperatures usually reach 29°C in Sioux City in August with moderate heat and humidity, falling to 16°C at night.

How sunny is it in Sioux City in August?

There are normally 10 hours of bright sunshine each day in Sioux City in August - that's 69% of daylight hours.

Does it rain in Sioux City in August?

There are usually 9 days with some rain in Sioux City in August and the average monthly rainfall is 75mm.

Sioux City August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:18 19:45
Saturday, 16th August 2025 05:34 19:25
Sunday, 31st August 2025 05:50 19:01

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