The National Weather Service says building high pressure over the region will allow dry and very warm conditions to develop over Western Washington beginning Friday and extending through early next week, including the Labor Day holiday.
High temperatures over Western Washington will rise into the mid 70s to mid 80s today, then reach the 80s to lower 90s this weekend. Increasing offshore flow will push highs into the lower 80s to mid 90s on Labor Day, peaking in the mid 80s to upper 90s on Tuesday. The warmest locations will be around the Greater Puget Sound region and the Southwest interior. Temperatures will be a little cooler in areas near larger bodies of water, including the coast, along the Strait of Juan De Fuca, and the northwest interior.
Areas that will have the most impact from the heat will be those that experience not only hot daytime temperatures but also have limited cooling overnight. Most locations will cool into the 50s while some locations such as the metro areas will only cool into the 60s.
Precautionary actions you can take during periods of prolonged heat include drinking plenty of fluids, seeking air conditioned areas, and avoiding prolonged outdoor activities. Use sunblock when outdoors. The elderly and small children are often most at risk from the heat. Do not leave children and pets in cars, even with cracked windows. Heatstroke can occur quickly in vehicles resulting in illness or even death.
The combination of the very dry summer and expected hot weather through early next week will increase the fire danger across Western Washington. Fuels like grasses and brush are quite dry and can catch fire easily, even from sparks, and will spread quickly. Avoid outdoor burning. If you are towing a boat or trailer, make sure the tow chains don`t drag on the ground and produce sparks. Be careful with any outdoor equipment that could throw sparks. Dispose of cigarette butts properly. Avoid parking your car or
motorcycle in tall grass, the heat from the engine can start a fire.