Around 150 firefighters were expected to work overnight into Sunday to bring the 80-100 hectare blaze under control, says the Department of Fire and Emergency Services District.
Last year topped the previous temperature record in Europe, registered in 2019, by a whopping 0.4 degrees Celsius (0.72 Fahrenheit), the EU’s Copernicus Climate Change Service said.
Dozens of fires that devastated large areas in both countries have been controlled, officials say, without revealing the full extent of the damage.
Three people killed in Syria's Latakia province, and some 100 fires burn land across neighbouring Lebanon, officials say.
The wildfires have affected more than 600 families but no fatalities have been reported so far.
California's previous record burn area was nearly 2 million acres in 2018 when the state had its most deadly wildfire that killed at least 85 civilians and destroyed nearly 19,000 structures in and around the mountain town of Paradise.
More than 2,500 firefighters are battling the Glass fire near the resort community of Calistoga, which has already destroyed 248 structures.
"We don't have those critical burning conditions that we were experiencing those last two nights," he said of Glass Fire raging through Napa and Sonoma counties in western US.
US Democratic challenger Joe Biden assails Trump as a "climate arsonist" whose reelection would be catastrophic for the environment.
Search and rescue teams, with dogs in tow, were deployed across the blackened ruins of southern Oregon towns as smoldering wildfires ravaged US Pacific Coast states after causing widespread destruction.
The skies across California have turned dark and orange despite it being daytime –– due to the wildfires, as if in a dystopian film no one wants any part of.
Uncontrolled wildfires rage across US West, incinerating town of Malden and threatening communities in Oregon and California, powered by high winds and unprecedented heat.
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