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San Francisco, California

California Heat Wave Brings Record-Breaking Temperatures, Heightened Fire Risk

Strategic Insights

— 2 min read

A heat wave that has settled over Northern California is expected to last through the weekend, bringing record-breaking temperatures and raising the risk of wildfire. San Francisco, where temperatures rarely exceed 90 degrees, hit a high of 94 on Tuesday, followed by 95 on Wednesday, breaking a 1996 record. The National Weather Service has warned of a "long duration" event that can raise the risk of illness and even cause heat-related deaths.

Key Takeaways:

  • San Francisco hit a record high of 94 degrees on Tuesday, followed by 95 degrees on Wednesday, breaking a 1996 record.
  • The heat wave has prompted officials to issue warnings and encourage residents to seek relief in cooling centers, which offered free rides.
  • Temperatures inland of San Francisco have climbed well above 100 degrees, with Santa Rosa hitting 105 degrees, San Rafael hitting 104 degrees, and San Jose hitting 107 degrees, a record for Oct. 2.
  • The cause of the heat wave is offshore winds, which are blowing from inland out to coastal areas, creating a dry heat.
  • Other parts of California have also seen temperatures way above the average for this time of year, further increasing the risk of fire.
  • The National Weather Service measures the dryness of potential wildfire fuel and has reported that it is "basically as dry as it gets."
  • Utility company Pacific Gas & Electric shut off power to some customers in Shasta, Tehama, and Butte counties due to the danger of fire amid high winds and low humidity.
  • Heat waves raise concerns about air conditioning availability, particularly in the Bay Area, where fewer people have AC, and officials urge people to check on older and disabled neighbors.
  • Deaths can climb 10 to 50 percent on days when the nights stay hot, as it becomes more difficult for people to cool down after a hot day.
  • People who work outdoors or who are homeless are also at greater risk in a heat wave.
  • San Francisco has a special protocol for checking on people living outdoors when temperatures are high, including outreach teams, bottled water, and symptom assessments.

Statistics:

  • San Francisco hit a high of 94 degrees on Tuesday, breaking a 1996 record.
  • Temperatures hit 95 degrees on Wednesday in San Francisco.
  • Santa Rosa hit 105 degrees on Wednesday.
  • San Rafael hit 104 degrees on Wednesday.
  • San Jose hit 107 degrees on Tuesday, a record for Oct. 2.
  • The National Weather Service measures the dryness of potential wildfire fuel and has reported that it is "basically as dry as it gets."
  • Pacific Gas & Electric shut off power to 2,100 customers in Shasta, Tehama, and Butte counties due to the danger of fire amid high winds and low humidity.

Sources:

  • Dylan Flynn, a meteorologist at the National Weather Service in California
  • Andrea Walker, a spokeswoman for the San Francisco Department of Homelessness and Supportive Housing
  • Scott Strazzante/San Francisco Chronicle, via Associated Press
  • National Weather Service

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