Photo/Illutration Significantly high temperatures are expected for most of Japan from July 26 to Aug. 3 as shown in red. (From the JMA website)

The sweltering heat wave is expected to return with a fury, with the Japan Meteorological Agency warning of once-in-a-decade high temperatures for most of the country from July 26 to Aug. 3.

The JMA issued the early warning advisory on July 20, calling on the public to take safeguards against heat stroke and for farmers in managing their crops.

Japan was blanketed by high temperatures across the country from July 16 to 18, which saw record highs for the year in many locations. 

From July 26, the risk of heat stroke is expected to increase across the country, with the exception along the Sea of Japan in the Tohoku region, due to a lingering high-pressure system in the Pacific Ocean.

The JMA describes the expected temperatures as "quite high," which are significantly high temperatures that occur only once in a decade for that location and time of year.

The agency releases early warnings when the five-day average temperature is three times or more likely to be "significantly higher" than normal. The last warning was issued for Okinawa and Amami-Oshima island on July 18.