Seattle is bright and warm this afternoon, with Boeing Field reporting clear skies, temperatures in the mid-60s and light winds. That early comfort will not stick around for long. Afternoon highs are expected to climb near 89°F today, with some inland neighborhoods pushing into the low 90s. The National Weather Service has a Heat Advisory in effect through 5 AM PDT Tuesday, June 16, 2026, so officials are urging basic heat precautions and reminding everyone not to leave children or pets unattended in vehicles.
Inland Heat, Cooler Coast
Temperatures will peak in the late afternoon, with downtown and other lowland neighborhoods expected to top out around 85 to 89°F while interior spots rise into the low 90s. A sea breeze will move in tonight, and a stronger onshore push is set to bring a noticeable cooldown by Tuesday. Highs will generally fall back into the 60s along the coast and the 70s inland, according to forecasts from NWS Seattle.
Heat Advisory And Resources
The advisory highlights hot daytime readings and warm nights that increase the risk of heat-related illness, especially for people without access to air conditioning. If you need a cool place to ride it out, you can call 2-1-1 or visit WA211 for lists of day centers and public cooling spaces. Keep water with you, take frequent breaks if you work outside, and never leave children or pets unattended in vehicles.
Marine And Wind Conditions
On Puget Sound and the Strait of Juan de Fuca, northwest winds will increase this afternoon with Small Craft Advisories in effect and a period of gale-force gusts possible Tuesday evening. Seas may climb to 10 to 12 feet Tuesday night into Wednesday. Admiralty Inlet is also likely to see Small Craft Advisory conditions for a time. Mariners are urged to keep an eye on updated marine forecasts from NWS Seattle.
What To Do Today
Try to schedule heavy outdoor chores for the early morning or evening, wear loose and light-colored clothing, and hydrate often. Check on older relatives and neighbors, bring pets inside, and plan for limited overnight relief since lows will stay relatively warm. If you or someone around you feels faint, dizzy, or nauseous, move to shade or a cooler place right away and seek medical help immediately.
