Bay Area to see triple-digit high temperatures and fire weather concerns

Bay Area temperatures are expected to climb into triple-digit highs for the first time this year, elevating fire weather concerns as gusty winds pick up across the region. 

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The heat is expected to arrive sometime around Tuesday afternoon, Dial Hoang, a meteorologist for the National Weather Service’s Bay Area office, told SFGATE over the phone. Most parts of the Bay Area will see daytime highs soar into the upper 70s and lower 80s, while inland valleys will likely surpass 100 degrees. Thursday is expected to be the hottest day of the week as an upper level trough generates temperatures 10 to 15 degrees above normal for this time of year.

“In terms of heat-related illnesses, we’re looking at a moderate risk, especially for sensitive populations,” Hoang said. People are encouraged to “drink plenty of water, take cooling breaks in the shade or indoors” and avoid outdoor activities during the hottest part of the day, between 3 and 5 p.m.

As the mercury rises and wind speeds increase, meteorologists tend to see fuels dry out, making it easier for fires to spread, Hoang said. He noted parts of Napa County could see gusts of 30 to 45 mph this week.

“Fires could start rapidly if the winds are strong enough,” Hoang said. “Basically, we want people to remember one less spark means one less fire.” 

Be careful throwing away matches or cigarettes, and avoid dragging chains or other objects from vehicles that could cause sparks, he said. If you’re planning a campfire or cookout, obey local burn bans and make sure you completely put out the fire before leaving. 

There are some chances for rain early this week before the heat arrives, but Hoang said the precipitation will more closely resemble coastal drizzle than anything else — and it won’t counteract any of the fire weather risks.

Check with the weather service for the latest updates on the forecast.