Temperatures in central Tokyo reached record levels Saturday after the mercury hit 31.3 degrees at 2pm.
Rising above 30 degrees Friday, the temperature in the capital broke a 98-year-old record.
Unseasonably high temperatures were also recorded in many eastern and central parts of the country as warm air from the south merged with the last typhoon, the Japan Meteorological Agency said.
The town of Yokoshibahikari in Chiba Prefecture recorded 32.1 degrees and the city of Shizuoka logged 32 degrees, according to the agency.
Temperatures topped 30 degrees the second day in a row for this time of year, the highest reading ever since records started 138 years ago.
The agency said temperatures will begin to cool down as a cold front begins to pass over the nation.
By Maesie Bertumen