A ridge of high pressure over the western United States is bringing unusually hot and dry conditions, with record temperatures expected from May 30 to 31, 2025. The hottest areas include southern Nevada, southeast California, and northwest Arizona. Cooler air and possible light rain from a Pacific cold front and Tropical Storm Alvin are forecast to arrive by early June.
A Heat Advisory has been issued for multiple regions in California, including the North Bay, East Bay, South Bay, Santa Cruz Mountains, and Central Coast, for Friday, May 30, 2025, due to forecast temperatures reaching up to 41 °C (105 °F).
A record-breaking heatwave affected Iceland from May 6 to 15, 2025, with temperatures reaching 26.6°C (79.9°F) at Egilsstaðir Airport and setting a new national May temperature record. The 10-day event was described by the Icelandic Meteorological Office as the most significant May heatwave in the country’s meteorological history.
The United Arab Emirates recorded 51.6°C (124.9°F) in the town of Sweihan, Al Ain Region, Emirate of Abu Dhabi, at 13:45 LT (09:45 UTC) on May 25, 2025, breaking the country’s May temperature record for the second consecutive day, just 0.4°C (0.7°F) below the all-time national maximum.
Havana’s Casablanca weather station recorded 38°C (100.4°F) on May 20, 2025, setting a new May temperature record. This surpassed the previous high of 37.3°C (99.1°F) recorded on May 19, 2024, according to Cuba’s Institute of Meteorology (INSMET).
Camp Mabry broke a 100-year-old daily heat on Thursday, May 15, 2025, as an early-season heat wave caused multiple daily heat records to break across south-central Texas. The heat wave is forecast to continue through the weekend into the next week, with some areas expected to see the highest May temperatures on record.
An unseasonal heatwave is forecast to bring record-breaking temperatures of up to 44.5°C (112°F) to south-central Texas this week, prompting heat advisories across the region.
Heat advisories are in effect across southern California from Friday to Saturday, May 9–10, 2025, with level 3 out of 4 HeatRisk issued for parts of the region due to the increased risk of heat-related illnesses.
A brutal heatwave has gripped Telangana this week, claiming 11 lives in just 24 hours and pushing temperatures past 45°C (113 °F). With large parts of India also facing extreme heat, alerts have been issued, and hospitals are reporting a sharp rise in heat-related illnesses.
Record-breaking temperatures were measured in Japan on Wednesday, March 26, 2025, with 143 stations either tying or breaking the record for the hottest March day on record.
