With a blast of extreme heat lining up for this week, Washington's highway watchers are already sounding the alarm. On Monday, WSDOT's traffic account amplified a National Weather Service warning, urging Seattle-area residents and travelers not to wait to prepare for an extreme heat event expected this week. The alert is aimed at commuters, outdoor workers, and anyone without reliable cooling as temperatures climb above seasonal norms, and agencies warn the heat could strain transit systems, make road surfaces hotter, and increase health risks for vulnerable residents.
As WSDOT Traffic wrote in a retweet of the National Weather Service, "Don’t wait until heat arrives to begin protecting yourself." The account, which covers traffic in King and Snohomish counties, posted the message Monday morning and urged people to plan ahead before the hottest days hit.
RT @NWS: Don’t wait until heat arrives to begin protecting yourself. The forecast calls for extreme heat this week, you can begin preparing…
— WSDOT Traffic (@wsdot_traffic) June 29, 2026
What Seattle Can Expect This Week
A broad heat dome will push dangerous temperatures into much of the country this week, and the Weather Prediction Center shows Major-to-Extreme HeatRisk across large swaths of the central and eastern United States, raising the chance of record highs and little overnight relief, according to the Weather Prediction Center. Locally, the NWS Seattle/Tacoma office says a warming, drier pattern could push inland highs into the upper 80s and low 90s in places, conditions that raise the risk of heat-related illness for people without air conditioning, per NWS Seattle/Tacoma.
How Local Agencies Are Responding To The Heat
Public Health, Seattle & King County recommends activating daytime cooling centers, rescheduling strenuous outdoor activities and stepping up outreach to seniors and people experiencing homelessness as part of its extreme heat response framework. For real-time listings of cooling locations and hours, the county points residents to the regional 2-1-1 service and its heat resources page, according to Public Health — Seattle & King County.
Tips For Drivers And Outdoor Workers
Drivers should watch for vehicle and pavement stress during extreme temperatures and never leave children or pets in parked cars, and if you spot a roadway hazard, WSDOT's traffic account asks people to call 911. For personal safety, the National Weather Service recommends staying hydrated, seeking air conditioning during peak heat and limiting outdoor exertion, guidance summarized on the NWS heat safety pages.
Officials urge residents to keep tabs on forecasts and agency feeds as conditions evolve, since local health and emergency pages will update cooling center lists and advisories if the HeatRisk changes. If you travel, check with your transit provider and plan to shift outdoor work to cooler hours where possible.
