This summer in Japan has tied with the previous year for the hottest on record, as stated by the Meteorological Agency. From June to August, temperatures were found to be 1.76 degrees Celsius higher than the average. This places the summer of 2023 alongside last year's peak temperatures, demonstrating significant warming trends over the years with national records dating back to 1898.

Western regions of Japan, including Osaka Prefecture, and the islands of Okinawa and Amami, marked their hottest summers since regional records were first kept in 1946. The temperature deviations reached 1.4 C and 0.9 C, respectively, compared to the 1991-2020 average, a timeframe that already reflected ongoing climate change. In eastern Japan, which encompasses cities like Tokyo, temperatures were reported to be 1.7 C above the average, further highlighting the severe impact of rising heat levels across the nation.