How to Deal with Foggy Windows on Rainy Summer Days?

[StJeremiah]

If the fog is not heavy and the outside temperature is not very cold, you can slightly open both side windows to allow the interior temperature to gradually match the outside temperature, which will help dissipate the fog. Use specialized anti-fog products; one application can prevent fogging for ten to fifteen days. Turn on the air conditioning in cooling mode, and the cold air will blow towards the windshield to clear the fog. When defogging, you can switch the air conditioning to external circulation to allow outside air into the cabin.

[McEllie]

I've encountered the issue of foggy car windows on rainy days way too many times. Driving with blurred vision is downright terrifying. The main reason is the high humidity during the summer rainy season, where the temperature difference between inside and outside the car causes moisture to condense on the windows, easily obstructing the view. My habit is to turn on the defogging function of the AC as soon as I get in the car, setting the temperature a bit lower. The cool air blown out can quickly reduce the surface temperature of the windows, evaporating those water droplets. Also, remember to switch to the external circulation mode or crack open a window slightly to let the humid air out. Don't rush to wipe it with your hand, as that can smear the glass and compromise safety. Additionally, I recommend regularly checking the AC system—for instance, replace the filter promptly if it's dirty, otherwise, the dehumidification effect will be poor. By handling it this way consistently, driving won't be such a headache anymore.

[SanRichard]

Foggy windows during summer rainy days can be particularly frustrating. Every time I encounter this issue, I immediately turn on the air conditioning to solve it. First, press the A/C button in the car to activate the cold air, set the temperature a bit lower (not too high), and aim the vents directly at the windows—this helps the fog dissipate much faster. At the same time, turn on the external circulation to let fresh air in. When the humidity is high, try cracking the window slightly for better results. I also like to keep a dry cloth in the car; if the fog doesn’t clear completely, wiping the windows is quick and easy. The whole process takes less than a minute and even helps cool down the car. Make a habit of using this trick to ensure clear visibility while driving—safe and hassle-free. Also, don’t forget to check if your air conditioning is functioning properly before driving in the rain, so it’s ready to use whenever needed.

[Poppy]

To defog the windshield, turn on the air conditioning for dehumidification. Lower the temperature, press the A/C button, and direct cold air towards the glass. Use the external air circulation or open the windows for faster moisture dissipation. Clear visibility is paramount for safety, so regular air conditioning maintenance prevents minor issues.