Japan is having record heat. Last week, the temperature near Tokyo went over 40ºC for the first time in June. It was 40.2 degrees Celsius in a city north of Tokyo. The hotter weather means people are using air conditioners more. This is making it difficult for power companies to produce enough electricity. Japan's government has asked people to use less electricity. A spokesman said: "We ask the public to reduce energy consumption during the early evening hours." He wants people to turn off lights from 3 pm to 6 pm and use air conditioners less.

Japan's heat wave will continue. The country's rainy season finished the earliest since records began in 1851. This means there'll be a long, hot summer. The government said: "We have unusual heat for the season. Please cooperate and save as much power as possible." Tokyo's power company warned there was a risk of power shortages and blackouts. There is also a risk of people getting heatstroke. More than 250 people were taken to hospital in Tokyo over the weekend with heatstroke. The government is advising people to drink water and not exercise outside.