Japan. June 2025 was the hottest since 1898 (start of data).
"average monthly temperature was 2.34 degrees Celsius higher than the standard value"
"Last week, the rainy season ended in the western region of Japan, the earliest date on record and around three weeks earlier than usual."
https://japantoday.com/category/national/japan-had-hottest-june-on-record-weather-agency