Today | Weather | Monday, June 29, 2026

Active Weather Warnings

Weather in Sioux City, Iowa

08:49 PM

Now

88° F

Feels Like 88°

Precipitation 51 %

Wind 10 mph

UV Index (0 - 11+) 0

Humidity 67 %

Today

Day 93°

Night 70°

Precipitation 55 %

Wind 8 mph

Sioux City Weather Forecast Updated

24 minutes ago

Last updated on June 29, 2026 at 8:24 PM

Air Quality in Sioux City

NOW

26 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 2.46 µg/m³

PM₁₀ 2.87 µg/m³

O₃ 0.028 ppm

NO₂ 0.9 ppb

SO₂ 0 ppb

CO 0.10 ppm

NH₃ 2.49 µg/m³

NO 0.01 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 – 2.46 µg/m³

PM₁₀ – 2.87 µg/m³

O₃ – 54.71 µg/m³

NO₂ – 1.6 µg/m³

SO₂ – 0.11 µg/m³

CO – 119.14 µg/m³

NH₃ – 2.49 µg/m³

NO – 0.01 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Sioux City

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued June 29 at 7:38AM CDT until June 29 at 9:00PM CDT by NWS Sioux Falls SD

Jun 29, 7:38 AM → Jun 29, 9:00 PM

WHAT: Dangerously hot conditions with heat index values up to 107.

WHERE: Portions of northwest and west central Iowa, northeast
Nebraska, and southeast South Dakota.

WHEN: Until 9 PM CDT this evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Updated: Jun 29, 8:24 PM Source: NWS Alert

Severe Future Possible

Severe Thunderstorm Watch

Severe Thunderstorm Watch issued June 29 at 6:34PM CDT until June 30 at 12:00AM CDT by NWS Sioux Falls SD

Jun 29, 6:34 PM → Jun 30, 12:00 AM

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
417 IN EFFECT UNTIL MIDNIGHT CDT TONIGHT FOR THE FOLLOWING AREAS

IN IOWA THIS WATCH INCLUDES 8 COUNTIES

IN NORTHWEST IOWA

CHEROKEE DICKINSON LYON
O'BRIEN OSCEOLA PLYMOUTH
SIOUX

IN WEST CENTRAL IOWA

WOODBURY

IN MINNESOTA THIS WATCH INCLUDES 8 COUNTIES

IN SOUTHWEST MINNESOTA

COTTONWOOD JACKSON LINCOLN
LYON MURRAY NOBLES
PIPESTONE ROCK

IN NEBRASKA THIS WATCH INCLUDES 2 COUNTIES

IN NORTHEAST NEBRASKA

DAKOTA DIXON

IN SOUTH DAKOTA THIS WATCH INCLUDES 11 COUNTIES

IN EAST CENTRAL SOUTH DAKOTA

BROOKINGS LAKE MOODY

IN SOUTHEAST SOUTH DAKOTA

BON HOMME CLAY LINCOLN
MCCOOK MINNEHAHA TURNER
UNION YANKTON

THIS INCLUDES THE CITIES OF ALCESTER, ALLEN, ARNOLDS PARK, AVON,
BERESFORD, BRIDGEWATER, BROOKINGS, CANISTOTA, CANTON,
CENTERVILLE, CHANCELLOR, CHEROKEE, ELK POINT, FLANDREAU, FULDA,
GEORGE, HARRISBURG, HARTLEY, HAWARDEN, HENDRICKS, HULL, HURLEY,
INWOOD, IRENE, IVANHOE, JACKSON, JEFFERSON, LAKE BENTON,
LAKEFIELD, LARCHWOOD, LE MARS, LENNOX, LUVERNE, MADISON, MARION,
MARSHALL, MILFORD, MONTROSE, MOUNTAIN LAKE, NORTH SIOUX CITY,
ORANGE CITY, ORLAND, PARKER, PIPESTONE, PONCA, ROCK RAPIDS,
ROCK VALLEY, SALEM, SANBORN, SCOTLAND, SHELDON, SIBLEY,
SIOUX CENTER, SIOUX CITY, SIOUX FALLS, SLAYTON, SOUTH SIOUX CITY,
SPIRIT LAKE, SPRINGFIELD, TABOR, TEA, TYLER, TYNDALL, VERMILLION,
VIBORG, WAKEFIELD, WINDOM, WORTHINGTON, AND YANKTON.

Updated: Jun 29, 8:24 PM Source: NWS Alert

Moderate Expected Likely

Heat Advisory

Heat Advisory issued June 28 at 9:10PM CDT until June 29 at 9:00PM CDT by NWS Sioux Falls SD

Jun 28, 9:10 PM → Jun 29, 9:00 PM

WHAT: Heat index values 100 to 105 expected.

WHERE: Portions of northwest and west central Iowa, northeast
Nebraska, and southeast South Dakota.

WHEN: Until 9 PM CDT Monday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

+ Read More

Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Monitor the latest forecasts and warnings for updates.

Updated: Jun 28, 11:19 PM Source: NWS Alert

Weather in Sioux City, Iowa

Sioux City Weather Forecast Updated

Air Quality in Sioux City

Pollutant Concentrations:

Health Recommendations:

Weather Alerts and Warnings for Sioux City

Extreme Heat Warning

Severe Thunderstorm Watch

Heat Advisory

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