Southwest Washington under a heat advisory from Sunday to Tuesday, says the NWS

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The NWS Seattle WA issued a heat advisory at 12:38 p.m. on Thursday valid from Sunday 11 a.m. until Tuesday 5 a.m. The advisory is for Olympia and Southern Puget Sound, Lowlands of Lewis and Southern Thurston counties, Middle Chehalis River Valley and Willapa and Black Hills.

"Hot conditions with high temperatures up to 90 degrees to 100 degrees and low temperatures down to 60 degrees expected. This will pose a moderate risk of heat-related illness," adds the NWS. "The warmest daytime high temperatures are expected Monday afternoon and the warmest overnight lows are expected Monday night into Tuesday morning. Areas away from water may see localized areas of major HeatRisk."

"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," describes the NWS.

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

During heat waves, consider the following tips from the NWS

• Stay hydrated: Keep yourself well-hydrated by drinking plenty of fluids.
• Stay in an air-conditioned room.
• Check on others: Stay out of the sun, and make sure to check up on relatives and neighbors.
• Protect your little ones and furry friends: Never leave young children and pets alone in vehicles, especially during hot weather when car interiors can become dangerously hot in a matter of minutes.
• Exercise caution outdoors: If you work or spend time outside, take additional safety measures.
• Find the right time: Consider rescheduling strenuous activities to early morning or evening if possible.
• Recognize warning signs: Know the signs and symptoms of heat exhaustion and heat stroke.
• Dress comfortably: Wear lightweight and loose-fitting clothing.

To reduce risk during outdoor work, the Occupational Safety and Health Administration (OSHA) recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. 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.