Sioux City Weather in September

With daytime temperatures of 25°C (77°F) and nighttime lows of 11°C (52°F), September in Sioux City brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 70 mm (2.8 in) falls on average.

Rainfall in Sioux City in September

Historically, approximately 9 days this month are expected to have rain, averaging 70 mm (2.8 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Sioux City in September

September tends to be one of the perfect months in Sioux City, with 25°C (77°F) in the afternoon and 11°C (52°F) overnight. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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• January
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For a detailed overview over the year and the best time to visit the United States of America, check out our Sioux City's climate page.

Sioux City Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 30%  

Precipitation 70 mm (2.8 in)  

Rainy days 9 days  

What to Wear in Sioux City in September

For Sioux City in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket.

What To Do in Sioux City in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Sioux City's climate page.

More climate data for Sioux City

Temperature Rainfall

See the full Sioux City climate overview or explore weather in the United States of America.