Phoenix, Arizona, reached 47.8°C (118°F) on August 7, 2025, setting the highest August temperature since records began in 1895. Other locations across the region also saw record highs, with Blythe, California, reaching 48.9°C (120°F).
Isesaki in Gunma Prefecture recorded 41.8°C (107.2°F) at 14:26 LT on August 5, 2025, setting Japan’s highest temperature on record and marking the second time in one week that the national record was broken.
Tampa saw its hottest temperature on record after reaching 37.8°C (100 °F) at 15:30 local time on July 27, 2025.
Extreme heat and humidity will affect large portions of the Southeastern United States from July 27 to 31, 2025, with over 30 million people under Level 4 Extreme HeatRisk alerts at the peak of the heatwave.
NOAA issued extreme heat alerts for over 90 million people across the Mid-Mississippi Valley and Mid-South on July 21, 2025, as a prolonged, dangerous heat wave continues across central and southeastern United States.
Dongkan National Meteorological Station in the Turpan Basin, Xinjiang, recorded an air temperature of 48.7 °C (119.7 °F) on July 20, 2025, setting a new all-time high for the station. Two nearby automated weather stations in the basin recorded temperatures over 50 °C (122 °F) the same day, including Mangxiaohu at 50.7 °C (123.3 °F). This marks one of the highest official temperatures ever recorded at a national meteorological station in China.
A dangerous and long-duration heat wave is forecast to affect large portions of the central and eastern United States from July 20 through August 1, 2025, beginning in the Southeast this weekend and expanding into the Mid-South, Mississippi Valley, and Midwest early next week. NOAA’s Climate Prediction Center has issued a high confidence outlook for extreme heat, with daily maximum heat index values exceeding 38°C (100°F) and limited overnight cooling.
Extreme heat affecting vast areas of China on July 16, 2025, pushed the national maximum electricity load above 1.5 billion kilowatts for the first time on record, marking the third new peak this month. Temperatures exceeded 46°C (114.8°F) at local stations in Xi’an and reached 42.2°C (108.0°F) on the Qinghai-Tibet Plateau, with widespread nighttime heat and record-high ground temperatures observed.
Nuclear power plants in France and Switzerland were forced to shut down or reduce output between July 1 and 3, 2025, as a major heatwave raised river water temperatures above regulatory cooling thresholds.
At least eight people have died across Spain, France, and Italy as an early-summer heatwave swept across Europe in late June and early July 2025, breaking temperature records and prompting red alerts and emergency responses.
