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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.
- 2929°C max day temperature
- 10 hours of sunshine per day
- 99 days with some rainfall
- 1616°C min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 7575 mm of monthly rainfall
- 88 (Very High) UV index
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Recommended for Iowa
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)
More about the USA
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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