Weather in Sioux City in September
Sioux City, United States averages a high of 24.4°C (75.9°F) and low of 14.2°C (57.6°F) in September, with 7 rain days and 10.3 hours of daily sunshine. Travel score: 86.9/100 (Excellent). The best time to visit Sioux City is September.
High
24°C76°F
Low
14°C58°F
🌧️
7
rain days
☀️
10.3
hrs/day sunshine
💧
65%
humidity
87— Excellent
September in Sioux City is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Sioux City?
How much does it rain in Sioux City in September?
Sioux City receives an average of 66mm of rainfall across 7 rainy days in September. The annual total is 766.3mm.
What should I pack for Sioux City in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
🎉Visiting United States in September?
Don't miss any public holidays — check before you book!
Compare Sioux City
Popular comparisons:
How can I plan my trip to Sioux City?
What other cities are near Sioux City?
What are other popular cities in United States?
What is the weather like in other months in Sioux City?
Data based on 1994–2024 averages · Last updated: 2024-12-31