Heat advisory affecting Puget Sound region from Sunday to Tuesday, says the NWS

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On Thursday at 12:38 p.m. a heat advisory was issued by the NWS Seattle WA valid from Sunday 11 a.m. until Tuesday 5 a.m. The advisory is for Foothills and Valleys of the North Cascades, Foothills and Valleys of Snohomish and Northern King Counties, Foothills and Valleys of Central King County, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Thurston and Lewis Counties and Eastside.

"Hot conditions with high temperatures up to 85 degrees to 90 degrees and low temperatures down to 60 to 65 degrees expected This will pose a moderate risk of heat-related illness," says the NWS. "The warmest daytime high temperatures are expected Monday afternoon and the warmest overnight lows are expected Monday night into Tuesday morning."

"Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration," states the NWS.

This advisory is in effect until Tuesday at 5 a.m.

NWS Heat Wave Safety Tips: Stay safe with these recommendations

• Stay hydrated: Drink plenty of fluids.
• Seek cool shelter: Opt for an air-conditioned room to stay comfortable.
• Stay out of the sun, and check up on relatives and neighbors.
• Ensure child and pet safety: Do not leave young children and pets unattended in vehicles when car interiors can reach lethal temperatures in a matter of minutes.
• Take extra precautions outdoors: If you work or spend time outside, be sure to take additional safety measures.
• Optimal Timing: When possible, reschedule strenuous activities to early morning or evening.
• Be alert to warning signs: Educate yourself about the signs and symptoms of heat exhaustion and heat stroke.
• Dress for comfort: Wear lightweight and loose-fitting clothing to stay cool.

To ensure safety during outdoor work, adhere to the Occupational Safety and Health Administration (OSHA)'s recommendations by incorporating regular rest breaks in shaded or air-conditioned environments. If someone is affected by heat, immediately transfer them to a cool and shaded area. In an emergency, call 911.

Source: The National Weather Service

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This story was originally published June 11, 2026 at 12:41 PM.