Sioux City (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sioux City.
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.
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 weather does bring rainfall during this period, between 70 mm (2.8 in) and 108 mm (4.3 in). Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.
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.
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 (IA) 3-Day Forecast
Sioux City on the map
Sioux City is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.