Sioux City (IA)
May
Weather in Sioux City, Iowa for May 2026
Your guide to Sioux City weather in May - trends and predictions
In general, the average temperature in Sioux City at the beginning of May is 22.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 21.4 °F by the end of May.
The climate of Sioux City in May is notably wet, with an average of 12 rainy days, and a total of 104.1 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
12
Rainy days
0
Snow days
22°/10°
Temperatures
21 km/h
Avg max wind
63 %
Avg humidity
Sioux City Weather May
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Temperatures trend during May in Sioux City
See the weather trend as well as the moving average line
May weather in Sioux City day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 19° /11° | 0.5 mm | 4 | |
| May 2 | Patchy rain possible | 16° /8° | 0.9 mm | 4 | |
| May 3 |  Sunny | 21° /6° | 0 mm | 6 | |
| May 4 | Sunny | 24° /6° | 0 mm | 6 | |
| May 5 | Sunny | 26° /8° | 0 mm | 7 | |
| May 6 |  Partly cloudy | 25° /8° | 0 mm | 7 | |
| May 7 |  Overcast | 25° /11° | 0 mm | 6 | |
| May 8 | Overcast | 25° /12° | 0 mm | 6 | |
| May 9 | Sunny | 30° /10° | 0 mm | 8 | |
| May 10 | Sunny | 31° /13° | 0 mm | 8 | |
| May 11 | Sunny | 31° /16° | 0 mm | 8 | |
| May 12 | Sunny | 30° /13° | 0 mm | 8 | |
| May 13 | Sunny | 32° /14° | 0 mm | 8 | |
| May 14 |  Cloudy | 32° /17° | 0.3 mm | 7 | |
| May 15 | Patchy rain possible | 24° /17° | 7 mm | 5 | |
| May 16 |  Heavy rain at times | 18° /10° | 4.1 mm | 4 | |
| May 17 | Overcast | 20° /8° | 0 mm | 5 | |
| May 18 | Overcast | 21° /5° | 4.4 mm | 5 | |
| May 19 |  Moderate or heavy rain shower | 18° /12° | 53.9 mm | 4 | |
| May 20 | Patchy rain possible | 12° /9° | 8.5 mm | 3 | |
| May 21 | Overcast | 13° /5° | 0 mm | 3 | |
| May 22 | Patchy rain possible | 17° /4° | 0.3 mm | 4 | |
| May 23 | Moderate rain at times | 16° /7° | 2.8 mm | 4 | |
| May 24 | Overcast | 18° /10° | 0 mm | 4 | |
| May 25 |  Light rain | 18° /11° | 11.7 mm | 4 | |
| May 26 | Overcast | 18° /10° | 0 mm | 4 | |
| May 27 |  Fog | 17° /11° | 0 mm | 4 | |
| May 28 | Overcast | 21° /12° | 0 mm | 5 | |
| May 29 | Light rain shower | 19° /14° | 9.7 mm | 4 | |
| May 30 | Sunny | 27° /11° | 0 mm | 7 | |
| May 31 | Overcast | 30° /13° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Sioux City in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Sioux City during May?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sioux City during May?
Significant rainfall exceeding 104.1 mm is expected in Sioux City during May, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sioux City during May?
The average wind speed in Sioux City during May is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Sioux City
Explore the daily rainfall trends and prepare for Sioux Citys May weather 💧
Typically, Sioux City has 12 rainy days in May with a total of 104.1 mm of rainfall.
UV exposure in Sioux City during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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