iPhone screen dims when outside

It's normal for your iPhone to dim outside since the sunlight can heat up your iPhone and to prevent the iPhone from overheating, it will dim to regulate its internal temperatures. If that happens, try to move it to a cool place out of the sunlight.

If the interior temperature of your device exceeds the normal operating range, you might notice these changes:

* The display dims or goes black

From: If your iPhone or iPad gets too hot or too cold - Apple Support

PDSF wrote: "This is not the issue. It is too dim to read from the moment I turn the phone on and is not related to the temperature at all. Any help would be greatly appreciated. iPhone 12 Pro."

PDSF ~ As your iPhone 12 Pro could be 5½ years old, it's worth checking for a weak, aging battery. So...

Does your iPhone 12 Pro still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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PDSF wrote: "It’s at 83%, so not new but not poor enough to cause this problem."

PDSF ~ If you don't know whether the battery is the original or not, this article will help:

iPhone parts and service history - Apple Support

...If it's the original, it's probably due for replacement. And 83% is not healthy as Apple suggests having the battery replaced at around 80%.

iPhone Battery Service

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Hi @alancito, I appreciate your responses but I don't think the battery is the problem. (Of course Apple recommends replacement at 80% as that means work for their stores.) I should have mentioned that the phone doesn't always stay dim. Often it snaps back to full brightness after a few minutes. Also should have mentioned that during the time it is dim, adjusting the brightness in Settings has no effect. It definitely seems like something is not working correctly.

This is not my issue. It is too dim to read from the moment I turn the phone on and is not related to the temperature at all. Any help would be greatly appreciated. iPhone 12 Pro.

It’s at 83%, so not new but not poor enough to cause this problem.