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You could wait until your iPhone throws up the high-temperature warning, and then, well, you know it's too hot.
That's the only mechanism that Apple offers.
But surely, the iPhone has a built-in temperature sensor, and there must be apps that can read and display that data.
Surely there's an app for that.
Well, I found one, but I had to download and test dozens of apps in order to find one that will display a reading from the temperature sensor.
The one I found is called Battery and charger test, and while this app looks rather simplistic and does display ads (some especially annoying), it also display a temperature, and this seems to be reasonably accurate. I checked the temperature of the iPhone using a thermal camera, and also warmed and cooled the iPhone to monitor temperature changes.
It seems reasonably accurate, and right now the best we seem to have.
I dug through a few dozen more apps after testing the Battery and charger test, but I couldn't find anything. If you know of another app that gives temperature readings, let me know.
Don't want to bother with an app? I can think of two other methods: