No, there is no limit on the highest temperature that can exist in the universe according to current scientific understanding.
Chapter 7 Temperature and its Measurement
Class VI NCERT Book Curiosity Science
Is there a limit to the highest temperature that can exist in the universe?
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Yes, the highest temperature theoretically possible is the Planck temperature, around
1.416808 × 10321.416808 × 10 32 Kelvin. At this extreme, the laws of physics as we know them break down, and current theories cannot describe conditions beyond this point.