The dangerously high temperatures that affected San Diego County have begun to decrease, giving way to cooler weather that will continue to drop gradually throughout the week. By Wednesday, temperatures are expected to return to near-normal levels across the county, both during the day and at night, providing relief for residents.

However, despite the expiration of heat alerts, a new concern has arisen: wildfire smoke. An air quality alert is in effect until Thursday due to degraded air quality, which could impact vulnerable groups. It is advised to limit outdoor activities in these conditions.

Today: return of the marine layer tonight, temps avg to 4-7 degrees below avg, gusty winds in mtns and deserts. Smoke from the Airport, Bridge, + Line fires will blow to the E to NE today, most likely to impact the IE, Riverside/SanBer mtn communities, and Coachella Valley. #CAwx pic.twitter.com/X2ONpaoyhA

— NWS San Diego (@NWSSanDiego) September 11, 2024

Throughout the week, temperatures in valley areas will continue to drop, while mountain regions will experience more tolerable weather. A low-pressure system in the Pacific Northwest will bring widespread cooling to the region, with temperatures expected to hover around or slightly below the seasonal average by the weekend.