Thousands of people ordered to evacuate in the face of the growing Fairview Fire, which has now spread to 7,700 hectares, officials say.
"This heatwave is on track to be both the hottest and longest on record in the state and many parts of the West for the month of September," says Governor Gavin Newsom, adding risk of power outages is real.
Hundreds of firefighters enduring high temperatures are battling against a wildfire along a major highway, as the western US broils under another day of blistering temperatures.
The floods affected China's Qinghai province, while millions of people in the southwest suffered a crushing heatwave.
Since at least the Roman era, the pass between Scex Rouge and Tsanfleuron glaciers has remained iced but it will be completely ice-free before summer is out, claims Glacier 3000 ski resort.
The European Space Agency warns about the effects of "extreme" land temperatures and shrinking rivers on agriculture and other industries.
Temperatures globally last month were 0.4 degrees Celsius above the 1991-2020 average, the World Meteorological Organization says.
The area that was burned this year was estimated to be more than double the size of Luxembourg, an amount of burned land never before recorded in Europe by August.
Some 15,000 square metres of forested area was on fire in western Berlin after a blaze at a bomb disposal site during a heat wave, emergency services say.
Firefighters battle to contain California's largest wildfire of the summer, a blaze near famed Yosemite National Park that has forced thousands of people to evacuate.
Health chief calls for readiness "for periods of high temperatures" in the southern European country, where temperatures surpassed 40 degrees Celsius last week.
Temperatures are expected to rise further in the UK, while the heatwave has contributed to deadly wildfires in France, Greece, Portugal and Spain.
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