Why do my car windows fog up?

My windshield gets so foggy in the mornings on my way to work. Why do my car windows fog up?

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Answer provided by
Melanie Mergen
Answered on Jul 26, 2022
Why your car windows fog up depends on air temperature and humidity. Typically, the condensation that causes your car windows to fog up will form on the side of your windows with warmer air and more humidity.
Why do my car windows fog up? If you’re blasting your air conditioning on a hot, humid summer day, you might end up with condensation on the outside of your windows. In the middle of winter, the warmer air inside your cabin might have more moisture than the cold, dry air outside, which could cause your windows to fog up on the inside.
Here are a few things you can do to stop your car windows from fogging up:
  • Use your windshield wipers to clear away outside condensation
  • Use a squeegee or towel to wipe away other condensation if you need to
  • Open your windows to balance the temperatures and humidity levels, inside and out
  • In summer: turn off your air conditioning or let it run warmer
  • In winter: run your heat on high to help the moisture in the cabin evaporate
  • Turn off your car’s air recirculation—the button that has the image of a car with a cycling arrow inside it—to help equalize the moisture levels inside and outside your car
Car windows fogging up isn’t just an everyday annoyance—it’s also a safety issue since it can affect your visibility while driving down the road. Driving with fogged-up windows could put you at risk of getting into a collision.
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