The Bay Area is in for a cool-down starting Sunday, but residents must contend with lingering wildfire smoke for longer. The NWS has noted a gradual cooling trend, with temperatures expected to drop by the weekend, while onshore breezes relieve the hot inland areas, according to the National Weather Service (NWS) San Francisco Bay Area and the Bay Area Air Quality Management District (BAAQMD).

Despite this, air quality remains a concern as the BAAQMD issued an air quality advisory for Thursday and Friday, with smoke from wildfires affecting the region in both the western U.S. and Canada. However, air quality is expected to be Good to Moderate on the Air Quality Index. The agency reported that the inversion layer traps smoke and pollutants, but as onshore winds increase, the smoke is anticipated to disperse somewhat. However, conditions can evolve quickly, and the impact of smoke can vary greatly depending on location.

In response to the advisory, residents are being urged to take precautions such as staying indoors with windows closed when possible, using air conditioning in recirculation mode, and utilizing air filtration systems to minimize exposure to smoke, which contains harmful particles and pollutants that can result in health issues like coughing, throat irritation, and complications for those with pre-existing respiratory conditions; children, the elderly, and individuals with respiratory illnesses are particularly at risk.

Over the weekend, locals can anticipate coastal regions having highs up to the mid-60s and inland valleys seeing temperatures ranging from the mid-80s to upper 90s, continuing with some triple-digit heat in the far interior regions. The National Weather Service forecasts "some patchy coastal drizzle, mist, and fog is possible through the rest of the morning," BAAQMD underscored that despite fluctuations in air quality, no Spare the Air Alert is currently in effect. Yet, they will be closely monitoring the situation for any smoke incursions.