Multiple heat advisories were issued across portions of California, Oregon, Washington, and Nevada on June 15, 2026. Temperatures are forecast to exceed 40°C (104°F) and could reach up to 44.4°C (112°F) in Trinity County, California.
Dangerous heat is expected across much of the central United States on June 9, 2026, with multiple National Weather Service offices warning that heat index values will reach 38 to 42°C (100 to 108°F) during the afternoon and evening. Heat Advisories remain in effect across Kansas, Missouri, Arkansas, Tennessee, Mississippi, Iowa, Nebraska, South Dakota, Minnesota, and Wisconsin, with the most dangerous conditions forecast across the Mid-South.
Major to Extreme HeatRisk conditions are forecast to develop across parts of the central United States this week as a strengthening heat dome expands over the region. National Weather Service offices have already issued Heat Advisories across portions of Kansas, Oklahoma, Arkansas, Missouri, Illinois, and Texas, where heat index values are forecast to reach 40 to 42°C (104 to 108°F).
Spain recorded 101 heat-related deaths during May 2026, making it the deadliest May since national monitoring began in 2015, while health authorities warned that heat extremes are arriving earlier in the year and increasing mortality risks across the country.
Portugal set a new national May temperature record on May 27, 2026, after Mora reached 40.3°C (104.5°F) during an early-season heatwave, according to the Portuguese Institute for Sea and Atmosphere (IPMA). The reading surpassed the previous May extreme of 40°C (104°F), recorded at Pinhão on May 30, 1953, and matched at Termas de Monfortinho on May 30 and 31, 2001.
France recorded its hottest May day since records began on May 26, 2026, while temperatures climbed to 37.8 °C in southwestern parts of the country on May 28. Multiple stations across France set new all-time May temperature records this week as a prolonged heat dome pushed daytime temperatures into the upper 30s°C (upper 90s°F) and kept nighttime temperatures unusually high across much of the country.
Eleven people have died after getting into difficulty in open water across the UK during a record late-May heat episode. The fatalities include nine children and two adults. The Met Office said 35.1°C (95.2°F) at Kew Gardens on May 26 provisionally broke the UK May and spring temperature record for the second consecutive day.
Seven deaths were linked to exceptionally high temperatures in France after the country recorded its hottest May day since national observations began, with a national average temperature of 24.4°C (75.9°F) on May 25, 2026.
A historic heatwave intensified across the UK on May 25, with 13 locations provisionally breaking the country’s all-time May temperature record. Kew Gardens reached 34.8°C (94.6°F), surpassing the previous record of 32.8°C (91.0°F), while temperatures above 30°C (86°F) expanded across large parts of England. Forecasts show the heat persisting into May 26, with London potentially reaching 35°C (95°F).
The United Kingdom could record its hottest May day in Met Office records on Monday, May 25, with highs forecast to reach 35°C (95°F). Unusually warm overnight conditions have already set a provisional national daily minimum-temperature record for the month of May.
