As of 5:35 a.m. Wednesday, June 17, 2026, Boeing Field (KBFI) was already checking in with clear skies and about 55°F (13°C) under light winds. Forecasters expect the morning marine layer to burn off by mid-morning, setting up mostly sunny skies and a high near 75°F this afternoon. Humidity should stay comfortably low, and overnight lows are still on track to slide back into the mid-50s.
Afternoon Outlook
Sun is set to own the afternoon, with northwest winds around 2–7 mph and slightly warmer readings inland than right along the water. Highs near 75°F are in the cards for Seattle proper, with a few degrees of bonus warmth farther inland, and that coastal stratus lurking this morning should break up by about 10 a.m., according to the National Weather Service. Tonight, expect light, variable winds as temperatures drift back toward the mid-50s.
Juneteenth And The Week Ahead
The warm-up keeps rolling into the holiday. Friday (Juneteenth) is expected to stay mostly sunny with a high near 82°F, and Monday through Tuesday could nudge into the mid-80s in the warmest inland valleys. The seven-day outlook does not show any measurable rain, and forecasters say a building offshore ridge will keep pushing temperatures upward through early next week. For a refresher on the heat earlier this week and what it meant for the region, check out our earlier coverage of the two-day heat blast.
Boaters And Beachgoers
Out on the coast, boaters should note that a Small Craft Advisory remains in effect for parts of the outer coastal waters through Thursday night, with elevated northwest winds and building seas making things choppy. If you are planning to head offshore this weekend, it may be smarter to stick to more protected waters or hold off until conditions settle down. Closer to town, onshore routes and ferries are looking at only light northerly winds, so most commutes and outdoor events in the city should land in that sweet spot of comfortably warm and not too breezy.
