Today | Weather | Wednesday, May 20, 2026

Weather in Sioux City, Iowa

04:53 PM
Now
Cloudy Weather
63° F
Feels Like 63°
Precipitation 47 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 39 %
Today
Partly Sunny with Showers
Day 63°
Night 46°
Precipitation 55 %
Wind 6 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Sioux City Weather Forecast Updated

Last updated on

Air Quality in Sioux City

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.27 µg/m³
PM10 3.51 µg/m³
O3 0.043 ppm
NO2 0.5 ppb
SO2 0.7 ppb
CO 0.11 ppm
NH3 3.36 µg/m³
NO 0.16 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.27 µg/m³
PM103.51 µg/m³
O384.83 µg/m³
NO20.99 µg/m³
SO21.91 µg/m³
CO124.71 µg/m³
NH33.36 µg/m³
NO0.16 µg/m³