How High Can the Temperature Inside a Car Get in Summer?

[ValerieLynn]

In summer, the temperature inside a car can reach up to 70 degrees Celsius. Here are some methods to cool down the car in summer: 1. Physical cooling: Mix alcohol and water in a ratio of one to ten, pour it into a small spray bottle, open the car door, spray a few times, then close the door. After two to three minutes, the temperature will drop. 2. Ventilation: Open three sides for ventilation. 3. Windows: Roll down the passenger window and repeatedly open and close the driver's door. 4. Air conditioning: After getting in the car, turn the external circulation to the maximum to expel the hot air inside. 5. Parking: Park the vehicle in a shaded area when parking. Leave some space in the windows when parking.

[April]

I've tested it several times - parking outdoors in summer for just two hours can make cabin temperatures soar above 60°C. Last month after lunch, my dashboard thermometer maxed out at 69°C when I returned to the parking lot, with seat surfaces too hot to touch. The windshield accumulates terrifying heat - steering wheel exceeded 55°C while metal components reached burn hazard levels. Most shocking was chocolate left on the center console, completely melted into paste within 30 minutes. Never leave lighters or other flammables inside - there are too many spontaneous combustion cases from sun exposure. If leaving the vehicle over 10 minutes, always cover the windshield completely with a sunshade.

[OParker]

As a car enthusiast who enjoys modifications, I conducted a specific test on a sunny day. At noon, with all windows closed, the cabin temperature soared past 65°C after 50 minutes. The area near the air vents reached 52°C, but the seat surface temperature hit 74°C—hot enough to fry an egg. Surprisingly, the roof wasn't the hottest part; the primary heat source was the windshield, with direct sunlight areas measuring a scorching 81°C. The engine bay was even more alarming, with temperatures near the exhaust pipe hitting 93°C, turning metal components into branding irons. If you must park outdoors, remember to remove bottled water, as high temperatures can cause plastics to release harmful substances.

[DiCamilla]

Once I forgot to close the sunroof when picking up my child, and half an hour later, the car felt like a sauna. The dashboard showed an outside temperature of 32°C, but inside it was a staggering 57°C. The safety buckle on the child seat was too hot to touch, and the crayons left on the back seat had melted. Tests showed that black interiors absorb heat much more aggressively than beige ones, with a temperature difference of nearly 8°C. Cracking the windows has limited effect, reducing the temperature by less than 5°C in 10 minutes. It's advisable to purchase aluminum foil sunshades, with the windshield-specific version reflecting up to 80% of heat. Never leave a child alone in the car—in the U.S., over 30 children die annually from vehicular heatstroke.

[SaraFitz]

The newly purchased thermometer came in handy. Last Wednesday at noon, actual measurements showed: after parking in the shade for 1 hour, the car interior reached 48°C; in an unshaded open parking space, it soared to 63°C. The most surprising was the mineral water bottle—left in the cup holder for two hours, the water temperature rose to 43°C, emitting a strange odor when opened. The metal car key heated up to 52°C, and the leather steering wheel surface reached 66°C. At 3 PM, an iPad was forgotten on the back seat—upon retrieval, it displayed an overheating alert, and the battery was completely dead. It's recommended to install a mobile car-moving app and turn on the air conditioning for ventilation in advance during extreme heat, which is ten times more efficient than cooling down by opening windows.

[StPaige]

Referencing NASA's greenhouse effect research, a car cabin in summer becomes a mobile sauna. Between 11 AM and 3 PM, the temperature inside a closed car rises by 0.8°C per minute. When parked outdoors in 35°C weather for 50 minutes, the average interior temperature can soar to 57°C, with the dashboard reaching up to 70°C! In the U.S., there have been lawsuits for leaving dogs in cars, where the temperature reached 63°C, causing heatstroke in pets. Personal care products require special attention: sunscreen becomes ineffective above 49°C, and perfume bottles may explode due to heat expansion. Carrying a cooling spray is highly practical—spraying it twice on the seats can instantly lower the temperature by 20°C.