We found one dictionary that defines the word high temperatures:

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1. high temperatures: Vocabulary.com

(Note: See high_temperature as well.)

Definitions from WordNet (high temperature) ▸ noun:  the presence of heat ▸ Also see high_temperature ▸ Words similar to high temperatures ▸ Usage examples for high temperatures ▸ Idioms related to high temperatures ▸ Wikipedia articles (New!) ▸ Words that often appear near high temperatures ▸ Rhymes of high temperatures ▸ Invented words related to high temperatures