Overall temperature isn’t 90C but your lunch could be in contact with those temperatures:

https://www.clickorlando.com/news/2019/09/26/heres-how-hot-t...

“In a locked vehicle, a dark dashboard, steering wheel or seat can often reach temperature ranges of 180 - 200 degrees F, which then warms the air trapped inside a vehicle.” 194F is 90C.

And that’s Florida, other parts of the globe have higher outdoor temperatures which result in higher internal temperatures.

Objects left on the dash of a black vehicle with gray interior get into the 180s (F obviously). I measured because it's where I cure small painted objects in the summer. I live at at a medium northerly latitude.

90C seems completely believable for hot climates.

Maybe not far off from 90, given you can fry eggs in open air in the sun and for that you need 65.

https://www.youtube.com/watch?v=PhYkUuvDsGA

> No car interior has ever reached 90C.

Ever seen a car on fire? I have.

Ever seen a car on fire caused by heating from the sun? Well maybe not. But I have seen an egg get cooked on the roof of a car as a demonstration.

Have you ever been inside a hot car? Metal surfaces can easily exceed 100C.