Heat Advisory Covers Napa Valley Through Monday Night as Rare October Hot Spell Lingers
Inland highs in the mid-90s to low 100s are forecast through Monday evening, and air officials have issued ozone alerts for Saturday and Sunday.
NAPA: A long-duration October heat wave is keeping Napa Valley under a heat advisory through Monday night, with the National Weather Service forecasting inland highs in the mid-90s to low 100s through Monday evening.
The Weather Service’s San Francisco/Monterey office issued its latest advisory products on Oct. 2, covering the North Bay interior mountains and valleys beginning Saturday morning. The longer-duration advisory runs through 10 p.m. Monday, Oct. 5, with maximum temperatures of about 35 to 39 degrees Celsius, roughly the mid-90s to low 100s Fahrenheit. Temperatures are running about 15 to 20 degrees above normal, and forecasters expect mild overnight lows and weak onshore flow to limit relief after dark.
Bay Area air quality officials added a second warning to the weekend: the Bay Area Air Quality Management District issued Spare the Air ozone alerts for Saturday and Sunday, expecting hot weather and light winds to raise ozone levels across valley corridors. The alerts advise residents to reduce driving, avoid gas-powered lawn equipment during peak afternoon hours, and postpone strenuous outdoor exercise to early morning.
Mild minimum temperatures and weak onshore flow will limit overnight relief.
What to do in the heat
The Weather Service advises drinking fluids consistently rather than only when thirsty, checking on elderly and isolated neighbors, never leaving children or animals in parked vehicles, and shifting outdoor activity to the cooler parts of the day. Cooling centers are open across multiple Bay Area counties for residents without air conditioning.
Health officials note that people with asthma, COPD, heart disease or other respiratory conditions should limit strenuous outdoor activity and follow Bay Area Air District air-quality guidance while the ozone alerts are in effect.
Coastal zones around San Francisco Bay had shorter advisory windows, but interior areas, including the North Bay interior valleys, carry the longest-duration products. The Weather Service says the heat advisories will be revised through the weekend as the pattern evolves.
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