Sioux City (IA)
August
Weather in Sioux City, Iowa for August 2026
Your guide to Sioux City weather in August - trends and predictions
In general, the average temperature in Sioux City at the beginning of August is 27.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.3 °F by the end of August.
Sioux City experiences moderate rainfall in August, with an average of 7 rainy days and a total precipitation of 247.8 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
24
Dry days
7
Rainy days
0
Snow days
28°/16°
Temperatures
21 km/h
Avg max wind
79 %
Avg humidity
Sioux City Weather August
Move between months or click on a day
Temperatures trend during August in Sioux City
See the weather trend as well as the moving average line
August weather in Sioux City day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Overcast | 25° /15° | 0 mm | 6 | |
| Aug. 2 |  Cloudy | 27° /14° | 0 mm | 6 | |
| Aug. 3 |  Thundery outbreaks possible | 25° /15° | 0 mm | 6 | |
| Aug. 4 |  Fog | 27° /15° | 0 mm | 6 | |
| Aug. 5 |  Moderate or heavy rain shower | 23° /17° | 8 mm | 5 | |
| Aug. 6 | Thundery outbreaks possible | 31° /19° | 0 mm | 7 | |
| Aug. 7 | Thundery outbreaks possible | 32° /19° | 0 mm | 7 | |
| Aug. 8 | Thundery outbreaks possible | 35° /22° | 0 mm | 8 | |
| Aug. 9 | Fog | 28° /22° | 0 mm | 6 | |
| Aug. 10 | Fog | 26° /16° | 0 mm | 6 | |
| Aug. 11 | Overcast | 29° /19° | 0 mm | 6 | |
| Aug. 12 | Fog | 30° /15° | 0 mm | 7 | |
| Aug. 13 | Fog | 30° /14° | 0 mm | 7 | |
| Aug. 14 | Thundery outbreaks possible | 30° /19° | 0 mm | 7 | |
| Aug. 15 |  Patchy light rain with thunder | 33° /21° | 20.3 mm | 7 | |
| Aug. 16 | Thundery outbreaks possible | 37° /21° | 0 mm | 8 | |
| Aug. 17 |  Sunny | 36° /22° | 0 mm | 9 | |
| Aug. 18 |  Moderate or heavy rain with thunder | 34° /23° | 14.3 mm | 7 | |
| Aug. 19 |  Light rain | 30° /21° | 10.3 mm | 7 | |
| Aug. 20 |  Light rain shower | 29° /19° | 1.4 mm | 6 | |
| Aug. 21 | Overcast | 29° /20° | 0 mm | 6 | |
| Aug. 22 | Thundery outbreaks possible | 29° /18° | 26.8 mm | 6 | |
| Aug. 23 |  Partly cloudy | 24° /14° | 0 mm | 6 | |
| Aug. 24 | Mist | 24° /8° | 0 mm | 5 | |
| Aug. 25 | Partly cloudy | 21° /6° | 0 mm | 6 | |
| Aug. 26 | Mist | 25° /6° | 0 mm | 6 | |
| Aug. 27 | Fog | 25° /11° | 0 mm | 6 | |
| Aug. 28 | Overcast | 23° /14° | 0 mm | 5 | |
| Aug. 29 | Mist | 28° /10° | 0 mm | 6 | |
| Aug. 30 | Mist | 24° /17° | 0.2 mm | 5 | |
| Aug. 31 |  Heavy rain | 17° /16° | 166.5 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Sioux City in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Sioux City forecast closer to your planned date for the most up-to-date weather information.
Change Month
Sioux City in August - FAQ
What are the expected maximum and minimum temperatures in Sioux City during August?
During August, expect a variety of temperatures with highs around 28° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sioux City during August?
Significant rainfall exceeding 247.8 mm is expected in Sioux City during August, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sioux City during August?
The average wind speed in Sioux City during August is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Sioux City
Explore the daily rainfall trends and prepare for Sioux Citys August weather 💧
Typically, Sioux City has 7 rainy days in August with a total of 247.8 mm of rainfall.
UV exposure in Sioux City during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
Quick links
More Sioux City weather pages
You are here
Where is Sioux City?Get accurate weather forecasts for Sioux City, located at latitude 42.5 and longitude -96.4. Stay updated with localized weather information tailored for Sioux City.
Found a mistake?
We appreciate your attention to details. Tell us here.