Historic rainfall affected much of Yucatán on May 29, 2026, with Mérida setting a new all-time May rainfall record after 154 mm (6.1 inches) fell in 24 hours. Floodwaters inundated roads, stranded hundreds of vehicles, and caused significant disruptions across the city and surrounding areas.
A storm system moving from the Great Basin into the Northern Rockies is expected to bring widespread rain, flooding concerns, and severe thunderstorms across multiple U.S. regions through June 1, 2026. The highest rainfall threat is forecast across portions of Montana on May 30, 2026, while severe storms capable of producing damaging winds and large hail are expected across parts of Nebraska and South Dakota.
A Severe Weather Warning remains in effect across a large part of Western Australia as an unusually deep low-pressure system approaches the southwest coast, bringing the threat of damaging to destructive wind gusts, severe thunderstorms, heavy rainfall, isolated tornadoes and very large waves through Monday.
New activity/unrest was reported for 4 volcanoes from May 21-27, 2026. During the same period, ongoing activity was reported for 18 volcanoes.
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.
A 64-year-old woman died after being swept away by floodwaters near her home in Cocke County, Tennessee, on May 28, as 76 to 127 mm (3 to 5 inches) of rain triggered flooding and multiple rescue operations across the county.
Residents across the South Carolina Midlands reported a loud boom and brief shaking late Thursday afternoon, May 28, 2026. The U.S. Geological Survey (USGS) later logged the event as an ‘M0.0 sonic boom’ near Saint Andrews, South Carolina.
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.
A submarine eruption that began on May 8, 2026, continues in the central Bismarck Sea, about 130 km (81 miles) southeast of Manus Island, Papua New Guinea. The eruption revealed a previously unmapped underwater volcano, now provisionally named Titan Ridge Volcano, in a remote and tectonically active area of the Pacific Ocean.
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.
