Heat advisory affecting Puget Sound region from Monday to Wednesday

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At 11:40 a.m. on Saturday, the NWS Seattle WA released a heat advisory valid from Monday 11 a.m. until Wednesday 11 p.m. The advisory is for 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, Downtown Everett / Marysville Area, Shoreline / Lynnwood / South Everett area, Eastside, City of Seattle, Lowlands of Pierce and Southern King counties and Eastern Kitsap County.

"Hot conditions with high temperatures between 85 and 95 degrees expected and low temperatures between 55 and 65. This will pose a moderate risk of heat-related illness," says the NWS. "Temperatures will peak on Tuesday in the upper 80s to low 90s, but remain in the upper 80s on Wednesday."

"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," explains the NWS.

This advisory is in effect until Wednesday at 11 p.m.

Ways to stay safe in the heat according to the NWS

• 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.
• Prioritize child and pet safety: Be vigilant about never leaving young children and pets in vehicles without supervision, especially during periods of intense heat, as car interiors can quickly become extremely hot.
• Be mindful outdoors: Take extra precautions when working or spending time outside.
• Time your activities wisely: If possible, reschedule strenuous activities to early morning or evening when the heat is less intense.
• Know the red flags: Understand the signs and symptoms of heat exhaustion and heat stroke.
• Dress appropriately: Wear lightweight, loose-fitting clothing to stay comfortable.

For a safer outdoor work environment, follow the Occupational Safety and Health Administration (OSHA)'s guidance by scheduling regular rest breaks in shaded or air-conditioned places. If anyone shows signs of heat illness, promptly move them to a cool, shaded area. In an emergency, call 911.

Source: The National Weather Service

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This story was originally published June 20, 2026 at 11:46 AM.