Dense Fog Blankets Philadelphia, Forcing Drivers to Slow Down

Low visibility and February chill grip the region until mid-morning

Published on Feb. 21, 2026

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A Dense Fog Advisory is in effect across much of the Philadelphia metro area, with visibility reduced to a quarter mile or less. Drivers are being urged to use low beams and leave extra space between vehicles as they navigate the wet and hazardous conditions on major highways like I-95, I-76, and the Schuylkill Expressway. The fog is expected to linger until around 10 AM, with rain becoming more widespread by the afternoon.

Why it matters

Dense fog can significantly impair visibility and create dangerous driving conditions, increasing the risk of accidents. This weather event is also impacting air quality, with a Code Orange Air Quality Alert in place, meaning pollution levels may be unhealthy for sensitive groups.

The details

Temperatures in Philadelphia are sitting at 34 degrees with 97% humidity, allowing the fog to linger. Wet pavement and calm winds are contributing factors. The National Weather Service has issued the Dense Fog Advisory for much of New Jersey, eastern Pennsylvania, Delaware, and eastern Maryland. Reduced visibility is expected on major highways and bridges, including I-76, I-676, the Schuylkill Expressway, and the Walt Whitman Bridge.

  • The Dense Fog Advisory is in effect until 10 AM this morning.
  • Rain is expected to become more widespread by the afternoon.
  • Periods of rain will continue into tonight, with temperatures dipping to the upper 30s.
  • Patchy fog may redevelop toward early Thursday.
  • Thursday will stay cloudy with another round of rain likely late, and highs in the low 40s.

The players

National Weather Service

The National Weather Service in Mount Holly has issued the Dense Fog Advisory for the region.

Philadelphia International Airport

At Philadelphia International Airport, temperatures are sitting at 34 degrees with 97% humidity, contributing to the dense fog conditions.

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The takeaway

This weather event highlights the importance of exercising caution and adjusting driving behaviors when visibility is severely reduced. Drivers should use low beams, leave extra space between vehicles, and be prepared for potential delays or hazardous conditions on the roads until the fog clears.