heat wave

noun
1.
an air mass of high temperature covering an extended area and moving relatively slowly.
2.
a period of abnormally hot and usually humid weather.

Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heat wave
 
n
1.  a continuous spell of abnormally hot weather
2.  (not in technical use) an extensive slow-moving air mass at a relatively high temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
When their predictions turn from cold snap to heat wave, say, it can play havoc
  with the forward price of gas.
Climatologists say heat wave takes toll on air conditioners.
Summer's heat wave has many of us running for cover.
You've been caught in a rolling blackout that state regulators have ordered as
  a heat wave brings on millions of air conditioners.
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