The best times to visit Sioux City for ideal weather are
April 30th to July 8th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Sioux City Travel Guide
Other Sioux City Travel Info
Weather in Sioux City
Average temperatures in Sioux City vary an incredible amount. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 31st percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Sioux City, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 89.4°F (31.9°C) with temperatures rarely dropping below 63.4°F (17.4°C) at night.
Sioux City Temperatures (Fahrenheit)
Sioux City Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Sioux City Perceived Temperature (F)
Sioux City Perceived Temperature (C)
Average Sioux City Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Sioux City are November, January, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid January. For example, on the week of January 8th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May with an average of 3 days of significant precipitation the week of May 21st.
When can you find snow in Sioux City? Weather stations report large amounts of snow likely to be deepest around January, especially close to mid February. The best time to ski (if at all) in Sioux City is often around around December 17th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Sioux City.
Snow on the Ground
The graph below shows the average snow on the ground in Sioux City (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Sioux City has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is April (49.4% relative humidity), and the most humid month is December (67%).
Wind in Sioux City is usually moderate. The windiest month is April, followed by May and March. April’s average wind speed of around 10.7 knots (12.3 MPH or 19.8 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early April where average top sustained speeds reach 19.8 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Sioux City.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||9.5||Gentle breeze||18||Strong breeze|
|Feb||9.4||Gentle breeze||17.1||Strong breeze|
|Mar||9.7||Gentle breeze||17.6||Strong breeze|
|Apr||10.7||Gentle breeze||19.4||Strong breeze|
|May||9.8||Gentle breeze||18.9||Strong breeze|
|Jun||7.9||Gentle breeze||16.5||Significant breeze|
|Jul||6.4||Light breeze||13.5||Strong breeze|
|Aug||6.2||Light breeze||13||Significant breeze|
|Sep||7||Gentle breeze||14||Strong breeze|
|Oct||8.2||Gentle breeze||15.7||Significant breeze|
|Nov||9.1||Gentle breeze||16.6||Strong breeze|
|Dec||8.8||Gentle breeze||16.1||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Sioux City?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Sioux City, IA, US is June, followed by May and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Sioux City in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Sioux City Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 81.6°F (27.6°C) and 34.9°F (1.6°C) with far warmer temperatures in the later months. Rain is somewhat common with 3 to 8 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 5 to 8 days of precipitation per month. June – August is the busiest season for tourism in Sioux City, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 81.7°F (27.6°C) and 44.4°F (6.9°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 2 to 5 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is far too cold this time of year in Sioux City to be enjoyable for warm weather travelers. The average high during this season is between 36.9°F (2.7°C) and 31.1°F (-0.5°C). On average, it rains or snows a smalll amount: 2 to 4 times per month. These times of year are fairly slow with tourists.