WEATHER: Heat Advisory issued as temperatures climb into 80s

The National Weather Service (NWS) on Sunday, June 8, 2025 issued a Heat Advisory for much of western Washington, warning that high temperatures through Monday evening could pose a moderate risk of heat-related illness.

The advisory, in effect until 10 p.m. Monday, June 9, includes King, Pierce, Snohomish, Thurston, Lewis, and Kitsap counties, along with surrounding foothill and valley areas.

Forecasters expect high temperatures to reach the mid-80s to lower 90s across most of the region, with parts of the Cascade valleys likely to hit the mid-90s.

The South King County area should see highs in the low to mid-80s through Tuesday.

“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,” the National Weather Service said in its bulletin.

NWS says that an upper level ridge over the region will bring warm temperatures through Monday. The ridge will weaken Monday and exit the region on Tuesday. Temperatures will gradually cool down each day starting Monday night. A trough will approach the coast on Wednesday and settle over the region through the weekend.

Overnight lows are expected to remain warm — in the mid-50s to lower 60s — offering limited relief.

Cold Water Warning

The weather service also warned of hazards associated with cold water temperatures in area lakes and rivers, which remain in the upper 40s to 50s despite the hot air temperatures.

“Cold water drains body heat up to 25 times faster than cold air,” the bulletin noted, increasing the risk of cold shock and drowning, even for strong swimmers.

Officials are urging residents to stay hydrated, avoid prolonged sun exposure, check on vulnerable neighbors, and never leave children or pets in vehicles.

Those who work or spend time outdoors should reschedule strenuous activities to early morning or evening, wear lightweight clothing, and take frequent rest breaks in shade or air-conditioned areas. The risk of heat stroke is highest during peak afternoon hours, especially in urban areas.

Residents in need of cooling centers or other resources can dial 211 or visit wa211.org.

Full Heat Advisory:

URGENT - WEATHER MESSAGE
National Weather Service Seattle WA
335 PM PDT Sun Jun 8 2025

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PDT MONDAY...

* WHAT...Hot conditions with high temperatures in the mid 80s to
  near 90 degrees with lower to mid 90s probable in the Cascade
  Valleys. Lows Monday morning in the mid 50s to lower 60s. This
  will pose a moderate risk of heat-related illness.

* WHERE...Portions of northwest and west central Washington.

* WHEN...Until 10 PM PDT Monday.

* IMPACTS...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.

* ADDITIONAL DETAILS...Water temperatures, including area lakes and
  rivers, remain cold (in the upper 40s and 50s) which 
  significantly increases the risk of cold shock and drowning, even   
  for confident swimmers in calm water. Cold water drains body heat 
  up to 25 times faster than cold air.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If planning to head to the water, always wear a life jacket and
dress for water temperature, not air temperature. Keep a close eye
on children and pets near water. Know the signs of cold shock, such
as involuntary gasping and rapid breathing, which drastically
increases the risk of drowning.

Drink plenty of fluids, stay in an air-conditioned room, stay out 
of the sun, and check up on relatives and neighbors. Young children 
and pets should never be left unattended in vehicles under any
circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when possible.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

For sheltering information and other human services in your area,
dial 211 during business hours or visit wa211.org anytime.

Video Forecast

Here’s the latest video forecast from local weather guy Michael Snyder:

Detailed 7-Day Forecast

Here’s the detailed 7-day forecast:

• Sunday Night: Clear, with a low around 63. North wind 5 to 7 mph. 
• Monday: Sunny, with a high near 83. North northwest wind 5 to 7 mph. 
• Monday Night: Mostly clear, with a low around 56. North northwest wind 5 to 7 mph. 
• Tuesday: Sunny, with a high near 81. West northwest wind 3 to 6 mph. 
• Tuesday Night: Partly cloudy, with a low around 54. West northwest wind around 6 mph becoming south southwest after midnight. 
• Wednesday: Mostly sunny, with a high near 75.
• Wednesday Night: Mostly cloudy, with a low around 52.
• Thursday: Partly sunny, with a high near 71.
• Thursday Night: Partly cloudy, with a low around 50.
• Friday: Mostly sunny, with a high near 67.
• Friday Night: Mostly clear, with a low around 48.
• Saturday: Sunny, with a high near 71.
• Saturday Night: Mostly clear, with a low around 49.
• Sunday: Mostly sunny, with a high near 70.