High temperatures expected to last throughout the week 

Another heat wave is set to roll through San Francisco and the Peninsula this week, with forecasters expecting near-record-level warmth and prime fire conditions.

Conditions will be dry and hot starting Tuesday, with temperatures rising through Thursday until a significant cool down Friday, according to the National Weather Service.

Temperatures will stay in the low-80s today, creep up to the mid-80s Tuesday and climb to the high-80s and possibly low 90s in some areas Wednesday and Thursday, National Weather Service forecaster Matt Mehle said.

Record temperatures for San Francisco are 89 degrees July 8, 90 degrees July 9 and 92 degrees July 10.

"At this time we’re not expecting it to get higher than any of those temperatures, but it will be close," Mehle said.

In addition to the excessive-heat watch in effect Tuesday through Thursday, Mehle expects a fire-weather watch to be announced for the region this week as well. There likely will not be high winds in the area, but conditions will be hot and dry, especially in the hills, he said.

Firefighters likely will not be able to rely on cool nighttime temperatures to fight fires like they have in recent weeks because the air will stay warm after the sun sets, Mehle said. Firefighters also will have to battle dehydration during these conditions, he said.

"It’s definitely not going to help the situation," Mehle said.

San Francisco and Peninsula residents likely will not have much smoke blown their way from fires outside of the Bay Area because of low winds, he said.

The impending warmth comes on the heels of a record stretch of heat two weeks ago.

"This isn’t the first strong heat wave we’ve had for the year and I doubt it’ll bethe last," Mehle said.

mrosenberg@sfexaminer.com

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