Today | Weather | Wednesday, August 12, 2026

Active Weather Warnings

Severe Thunderstorm Watch

Weather in Sioux City, Iowa

06:50 AM

Now

72° F

Feels Like 73°

Precipitation 62 %

Wind 6 mph

UV Index (0 - 11+) 0

Humidity 95 %

Today

Day 90°

Night 70°

Precipitation 10 %

Wind 9 mph

UV Index (0 - 11+) 6

Sioux City Weather Forecast Updated

41 minutes ago

Last updated on August 12, 2026 at 6:09 AM

Air Quality in Sioux City

NOW

36 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 8.69 µg/m³

PM₁₀ 9.16 µg/m³

O₃ 0.011 ppm

NO₂ 1.6 ppb

SO₂ 0.2 ppb

CO 0.10 ppm

NH₃ 0.93 µg/m³

NO 0 µg/m³

PM_2.5 – 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)

PM_2.5 – 8.69 µg/m³

PM₁₀ – 9.16 µg/m³

O₃ – 22.52 µg/m³

NO₂ – 2.96 µg/m³

SO₂ – 0.49 µg/m³

CO – 119.76 µg/m³

NH₃ – 0.93 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Sioux City

Severe Future Possible

Severe Thunderstorm Watch

Severe Thunderstorm Watch issued August 12 at 6:06AM CDT until August 12 at 10:00AM CDT by NWS Sioux Falls SD

Aug 12, 6:06 AM → Aug 12, 10:00 AM

SEVERE THUNDERSTORM WATCH 573 REMAINS VALID UNTIL 10 AM CDT THIS
MORNING FOR THE FOLLOWING AREAS

IN IOWA THIS WATCH INCLUDES 4 COUNTIES

IN NORTHWEST IOWA

BUENA VISTA CHEROKEE

IN WEST CENTRAL IOWA

IDA WOODBURY

THIS INCLUDES THE CITIES OF BATTLE CREEK, CHEROKEE, HOLSTEIN,
IDA GROVE, SIOUX CITY, AND STORM LAKE.

Updated: Aug 12, 6:09 AM Source: NWS Alert