The Japanese government classified an "unprecedented" heatwave that's sweeping the country as a natural disaster Tuesday.

The country's Fire and Disaster Management Agency said that since the beginning of the month, the extreme heat has killed at least 80 people and sent  more than 35,000  to the hospital.  On Monday, temperatures in the city of Kumagaya — which is outside of Tokyo — hit 106 degrees Fahrenheit.

That's reportedly the  highest temperature  ever recorded in Japan since officials started keeping track.

The Japan Meteorological Agency warned high temperatures will continue into early August.

Its advising people to stay out of direct sunlight and  drink plenty of water .

As the heat continues, a government spokesman said officials might  extend the summer holiday  for students since the majority of public schools do not have air conditioning.

Additional reporting from  Newsy affiliate CNN .