Seattle, Washington — An unseasonable surge of early-season heat will build across Washington starting Friday, May 8, pushing temperatures well above normal and increasing risks for travel and outdoor exposure across Seattle, Spokane, Tacoma, Olympia, and Yakima.
According to NOAA’s Climate Prediction Center, temperatures will trend 70–80% above normal through May 14, with the most intense heat arriving Friday afternoon. The peak window runs from 2 p.m. to 7 p.m. Friday and Saturday, when inland areas and valleys are expected to warm quickly under strong high pressure.
That heat will translate into immediate impacts. Road surfaces along I-5 and I-90 may soften during peak afternoon hours, increasing stress on vehicles and raising the risk of tire issues, especially on long-distance travel routes. In urban areas like Seattle and Tacoma, heat buildup on pavement and buildings will push temperatures higher in dense neighborhoods.
Limited overnight cooling will add to the strain. Temperatures will remain elevated after sunset, particularly in metro areas and the Puget Sound region, reducing relief and increasing exposure risk for those without access to cooling.
Dry conditions combined with heat may also elevate fire risk in central and eastern Washington, especially near Yakima and Spokane where vegetation can dry quickly.
This is part of a broader shift as strong high pressure expands inland, driving unseasonable heat across much of the western United States.
Residents should limit outdoor activity during peak afternoon heat, stay hydrated, and avoid leaving vehicles or equipment in direct sunlight. Drivers should check tire conditions and remain alert for heat-related vehicle issues.
The highest risk for heat-related impacts will occur each afternoon between 2 p.m. and 7 p.m. Friday through Sunday.
