red heat

noun

: the state of being red-hot
also : the temperature at which a substance is red-hot

Examples of red heat in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In anticipation of several days of high temperatures exceeding 90 degrees next week, Allegheny County officials are issuing a code red heat advisory for Monday, June 29; Tuesday, June 30; and Wednesday, July 1. Garrett Behanna, CBS News, 27 June 2026 In Italy's capital, which remains under a red heat alert, tourists tried to cool off seeking shade near buildings and dunking their heads under public fountains. ABC News, 27 June 2026 More than half of the country’s mainland regions — 58 of 96 — were under the most severe red heat alert, an all-time record. Taylor Ward, CNN Money, 24 June 2026 The public safety push comes as much of France swelters under red heat alerts, with temperatures in parts of the country forecast to top 104 degrees, the AP reported. Jessica Mekles, FOXNews.com, 23 June 2026 Meteo France placed 54 departments, about half the country, under a red heat wave alert. Samuel Petrequin, Los Angeles Times, 23 June 2026 Amid red heat warnings, the highest level in the country, some outdoor sports events were canceled over the weekend. Georg Szalai, HollywoodReporter, 22 June 2026 In Paris, the Eiffel Tower was closed on July 1 and July 2, because the city is under a red heat wave warning, which is the highest designation. Staff Author, Travel + Leisure, 2 July 2025 Portuguese authorities issued a red heat warning Monday for seven of 18 districts as temperatures were forecast to hit 43 degrees Celsius (more than 109F). Suzan Fraser, Chicago Tribune, 30 June 2025

Word History

First Known Use

1665, in the meaning defined above

Time Traveler
The first known use of red heat was in 1665

Browse Nearby Words

Cite this Entry

“Red heat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/red%20heat. Accessed 5 Jul. 2026.

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