Yosemite National Park is definitely worth a visit
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Sioux City (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sioux City.
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Climate overview of Sioux City
Sioux City, Iowa, United States of America, sees big temperature differences between seasons, with July peaking at 30°C (86°F) and January dropping to -1°C (30°F).
With around 739 mm (29 in) of annual rain/snowfall, the city has moderate precipitation levels. June is the wettest month and January the driest. It also has a distinct dry season from November to March, with very warm summers and very cold winters.
Sioux City Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sioux City - and find the best time to visit.
Monthly Temperature in Sioux City
Visitors to Sioux City can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a very warm 30°C (86°F) in July to a very cold -1°C (30°F) in the coolest month, January.
Nights vary from 17°C (63°F) in July to around -13°C (9°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sioux City
Generally, Sioux City experiences moderate precipitation patterns, averaging 739 mm (29 in) yearly. The climate in Sioux City shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 108 mm (4.3 in) of precipitation over 13 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 13 mm (0.5 in) of snowfall over 6 snowy days. For more details, please visit our Sioux City Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Sioux City
The most comfortable overall weather for exploring Sioux City is usually found in September. Conditions are generally least comfortable in January, February, March and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
cold
Mar
cold
Apr
good
May
very good
Jun
very good
Jul
good
Aug
very good
Sep
excellent
Oct
very good
Nov
mixed
Dec
cold
- Best overall: September
- Warmest weather: July
- Fewest rainy days: January and November
- Seasonal pattern: A distinct dry season from November to March, with very warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -13°C (9°F).
Frequently asked questions about the climate in Sioux City
What is the best time to visit Sioux City?
September typically offers the most optimal weather in Sioux City. In contrast, January, February, March and December tend to have less optimal conditions. Sioux City has a distinct dry season from November to March, with very warm summers and very cold winters.
What temperatures can I expect in Sioux City?
Daytime highs range from -1°C (30°F) in January to 30°C (86°F) in July. Nighttime lows range from -13°C (9°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Sioux City get?
Annual rainfall is around 739 mm (29 in). June is the wettest month with 108 mm (4.3 in), while January is the driest with 13 mm (0.5 in).
Sioux City 3-Day Forecast
Sioux City on the map
Sioux City is highlighted - select any city to see its climate.
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