Car Windows Fogging Up Inside When It Rains – What To Do?

If you've been driving in the rain and your car windows have fogged up, you know how difficult it can be to see. This can be dangerous, especially if you need to make a sudden move.

So what's the best way to clear foggy windows? Luckily, we have researched this topic to compile a list of anti-fogging ideas for your car.

There's nothing worse than driving in the rain and having your windows fog up.

It's hard to see, and it can be dangerous. But there are some things you can do to help prevent your windows from fogging up in the first place.

  1. Crack the windows open
  2. Clean your windows regularly
  3. Turn on/off the AC or heater
  4. Apply defogging agents
  5. Install high-quality windshield wipers
  6. Use a vinegar and water mixture
  7. Park in the sun to dry off the windows

This post will show you how to stop your car windows from fogging up. We'll also give you tips on what to do if your windows fog up.

Traffic jam while driving in heavy rain - Car Windows Fogging Up Inside When It Rains - What To Do

Why Do My Car's Windows Fog Up When It Rains?

side mirror of the car mobolism in the rain. drops, glass

When it rains, do you find that your car windows fog up on the inside? If so, you're not alone.

It's one of the most annoying things that can happen when driving in the rain: your windows start to fog up, making it hard to see.

It's a prevalent problem that several different things can cause. Luckily, you can do a few things to prevent this from happening or at least minimize the problem.

Why Are The Inside Of My Windows Foggy?

Driving in the rain, your car windows will inevitably fog up. But have you ever wondered why this happens? The answer has to do with physics and the way that water vapor interacts with cold glass.

When warm, humid air comes into contact with a cold surface, the water vapor in the air condenses into tiny droplets of liquid water.

This is why your car windows fog up on a rainy day - the glass is cold, and the outside air is warm and full of moisture.

The windows fog up because the warm, moist air inside your car comes into contact with the cold, dry air outside. This change in temperature causes the water vapor in the air to condense on the windows.

But then, if your car's ventilation system is not working correctly, this condensation will not happen, and the windows will remain clear. In addition to annoying, this can also be dangerous as it can reduce your driving visibility.

As a result, ensuring that your car's ventilation system is in good working order to avoid foggy windows is vital.

What Typically Causes Foggy Car Windows?

girls hand draw sun on frozen car window at winter

A foggy windshield can be a pain, especially when trying to get somewhere in a hurry.

But have you ever wondered what causes your windshield to fog up? It turns out there are a few different factors that can contribute to a foggy windshield.


One of the most common causes is a difference in temperature between the inside and outside of your car.

When it's cold outside, and you crank up the heat in your car, the warm air inside can condense on your windshield, causing fog.

This is why it's essential to ensure your car's heater is working correctly- if it's not blowing hot air, it can make your windows more likely to fog up.

Dirty Windows

Another common cause of foggy windows is dirty or unclean windows. If dirt, dust, or grime is on your windshield, it can trap moisture and cause the glass to fog up.

That's why it's essential to keep your windshield clean, both inside and out. A quick wipe-down with a clean cloth should do the trick.

Dirty glass on the car

Mechanical Issues

Finally, sometimes a foggy windshield can be caused by mechanical issues with your car.

If there's something wrong with your car's ventilation system, for example, it can cause the air inside your vehicle to become too moist, leading to fog on your windows.

If you think there might be an issue with your car's ventilation system, it's best to take it to a mechanic to check it out.

What Can I Do To Keep My Windows From Fogging When It Rains?

It can be frustrating when your car windows fog up when it's raining outside. However, you can do a few things to help prevent this from happening.

1. Crack The Windows Open

Even the most well-sealed car can suffer from windows fogging up when it rains. The warm, moist air inside your vehicle condenses on the cold glass, causing that telltale white mist.

Cracking your windows open can help to prevent this by allowing the moist air to escape.

However, you don't want to crack your windows too much, or you'll let in too much outside moisture and defeat the purpose.

Start by opening your front windows slightly; if that doesn't do the trick, open your rear windows. If all else fails, you can try using a dehumidifier or point a fan toward your windshield to help dry out the air inside your car.

With a little trial and error, you should be able to find a combination that works for you.

2. Clean Your Windows Regularly

One of the most important is to clean them regularly. Dirt and grime can build up on the glass, creating a surface that is more likely to fog up.

Clean your windows regularly with a glass cleaner and a soft cloth. You may also want to use a defogger on your windows occasionally. This will help to keep them clear and free of fog.

3. Turn On/Off Air Conditioner Or Heater

Another option is to turn on your air conditioning or heater.

This will help to circulate the air inside your car. Besides that, this will help to equalize the temperature difference and prevent condensation from forming.

Additionally, you can use a dehumidifier to help remove moisture from the air inside your car.

4. Apply Defogging Agents

You can try using a defogging spray or wipes on your windshield before you start driving. Some of these products can help to prevent condensation from forming on your windows.

These products can help prevent moisture from condensing on your windows and make it easier to see while you're driving in the rain.

5. Install High-Quality Wipers

Good wipers are vital for keeping your windshield clean and clear, especially when it rains. They help remove raindrops, sleet, snow, and debris from the glass, providing a clear view of the road.

In addition, good wipers help to reduce the risk of water spots and streaks on your windshield.

6. Use A Vinegar And Water Mixture

Mist the solution onto your windows and wipe away the fog with a clean cloth. The vinegar will help to break down the water molecules, making it easier to wipe away the condensation.

Besides that, the vinegar will leave a thin film on your windows that will help to prevent future fogging. This is a quick and easy way to clear your car windows, even when it's raining outside.

7. Park In The Sun To Dry Your Windows

The sun will help dry off the windows and prevent them from fogging. You can crack open a window, even a little bit, to help ventilate the car and keep the air moving.

If your windows fog up, you can use a windshield squeegee or a piece of cloth to wipe them down. And never leave your car running with the windows up, as that will worsen the problem.

Other Tips For Driving In The Rain?

Highway Driver POV Through Raindrop Car Windshield During Rain

Driving in the rain can be challenging, but you can do a few things to stay safe.

  1. First, make sure your windshield wipers are in good working order. Old or damaged wipers may streak your windshield, making it difficult to see.
  2. Second, slow down and allow extra space between you and other vehicles. It takes longer to stop on wet roads, so give yourself plenty of time to brake.
  3. Finally, be cautious of hydroplaning. This occurs when your tires lose contact with the road due to a water build-up. If you start to hydroplane, slowly ease off the gas pedal and avoid sudden turns.

Following these tips can help ensure a safe and successful journey next time you find yourself driving in the rain.

Final Words

No matter what you do to try to stop them, sometimes car windows will still fog up when it rains.

If this happens to you, give yourself some time and patience and wait for the window to clear again. It won't take long before you can see them again and continue your journey.

To get more tips on keeping your vehicles safe and well-maintained, see our posts below:

How Long Do Spare Tires Last? [And How Far Can You Drive On Them]

Traction Control Light Came On – What Could Be Wrong?

Car Sounds Louder Than Usual – What To Do?

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