heat wave


: a period of unusually hot weather

Example Sentences

Recent Examples on the Web Climate change also made the region’s heat wave this past summer 30% more likely, scientists estimate. Nick Roll, The Christian Science Monitor, 7 Nov. 2022 College campuses, specifically students and faculty on the West Coast, struggled with the intense heat wave. Thao Nguyen, USA TODAY, 3 Nov. 2022 Just this past September, the West Coast broke nearly 1,000 temperature records during a 10-day heat wave, CalEPA said. Stephanie Elam, CNN, 2 Nov. 2022 Since 2017, 20% to 30% of whales the group observed were within 20 miles of shore compared with less than 5% before the heat wave. Tara Duggan, San Francisco Chronicle, 20 Oct. 2022 Last month — during the worst September heat wave ever recorded in California — Gov. Gavin Newsom signed an executive order encouraging ports to waive rules that require berthed ships to plug in. Tony Briscoestaff Writer, Los Angeles Times, 17 Oct. 2022 During the longer heat wave, from Aug. 8 to 17, the U.K. recorded 1,458 excess deaths among the elderly, who are particularly vulnerable to extreme heat. Eamon Barrett, Fortune, 12 Oct. 2022 During California’s heat wave this summer, when air-conditioning use surged, LLNL’s utility told the facility to prepare for power cuts of 2 to 8 megawatts. Byjacklin Kwan, science.org, 11 Oct. 2022 When the inevitable August heat wave hits hard, lay out with a glass of green gazpacho. Tiffany Hopkins, Bon Appétit, 11 Oct. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'heat wave.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1893, in the meaning defined above

Time Traveler
The first known use of heat wave was in 1893

Dictionary Entries Near heat wave

Cite this Entry

“Heat wave.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heat%20wave. Accessed 2 Dec. 2022.

Kids Definition

heat wave


: a period of unusually hot weather

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