Despite the sizzling climate, everyone sweated it out in face masks to prevent the spread of Covid-19.
Most homes in North Korea do not have air conditioning, with data suggesting that only a quarter of the population has access to electricity.
State media issued a series of warnings about the dangerously high temperatures over the past week.
"Officials and working people in all the fields and regions across the country have turned out in the campaign for preventing the damage from fierce heat and drought," the Rodong Sinmun newspaper said last week.
The paper added that forestry officials should be on the lookout for wildfires, and agricultural workers should watch out for pests and other heat-related crop damage.
A health official told state-run KCTV last week that North Korea expected another heatwave at the end of the month.
Natural disasters tend to have a greater impact on the country due to its weak infrastructure, while deforestation has left it vulnerable to flooding.
A series of typhoons last summer triggered floods that damaged farmland and destroyed thousands of homes.
Last month, North Korean leader Kim Jong Un admitted that the country's food supply situation was "getting tense" due to the lingering typhoon damage, and called for steps to minimise the impact of natural disasters.