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Active Weather Warnings

Dense Fog Advisory

Weather in Wilmington, Delaware

06:56 AM

Now

46° F

Feels Like 37°

Precipitation 13 %

Wind 14 mph

Humidity 98 %

Today

Day 61°

Night 41°

Precipitation 0 %

Wind 10 mph

UV Index (0 - 11+) 5

Wilmington Weather Forecast Updated

20 minutes ago

Last updated on March 21, 2026 at 6:36 AM

Air Quality in Wilmington

NOW

35 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 6.02 µg/m³

PM₁₀ 8.23 µg/m³

O₃ 0.038 ppm

NO₂ 2.5 ppb

SO₂ 0.4 ppb

CO 0.15 ppm

NH₃ 0.79 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 – 6.02 µg/m³

PM₁₀ – 8.23 µg/m³

O₃ – 74.1 µg/m³

NO₂ – 4.65 µg/m³

SO₂ – 0.93 µg/m³

CO – 171.78 µg/m³

NH₃ – 0.79 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Wilmington

Moderate Expected Likely

Dense Fog Advisory

Dense Fog Advisory issued March 21 at 5:29AM EDT until March 21 at 8:00AM EDT by NWS Mount Holly NJ

Mar 21, 5:29 AM → Mar 21, 8:00 AM

WHAT: Visibility as low as one quarter mile in dense fog.

WHERE: In Delaware, New Castle County. In New Jersey, Mercer,
Middlesex, Camden, Gloucester, Northwestern Burlington, and Salem
Counties. In Pennsylvania, Delaware and Philadelphia Counties.

WHEN: Until 8 AM EDT this morning.

IMPACTS: Low visibility could make driving conditions hazardous.

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If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Updated: Mar 21, 6:36 AM Source: NWS Alert