I'm sure it would be 98 degrees C, not F, but even so, I've seen 110 degrees C in the summer when towing in my Passat without any warning lights. I wouldn't worry about it. There are far too many electronics that will throw up a warning at the slightest voltage spike in our cars these days. I only worry about warning lights if the stay on.
I had a tyre pressure warning message in my Passat the other day. I've got my winter wheels on that have no sensors in them, so where the car got its rouge signal from, who knows.