Forecasts from the National Weather Service and other models indicate a high near 71–72°F for Seattle on August 28, 2026, driven by morning marine layer clouds giving way to mostly sunny skies, light southwest winds, and typical late-summer Pacific moderation that caps daytime warming below the 75°F seasonal average. This consensus supports the market's strong tilt toward the 72–73°F bin at 59% implied probability, with 70–71°F as a close secondary outcome. Recent model runs show minimal spread and no signals of stronger onshore flow or clearing that could push temperatures higher, though any unexpected afternoon sun could nudge readings into the mid-70s. The 68–69°F and cooler tiers remain low-probability under current guidance.