**Forecast models and official guidance from the National Weather Service and private providers indicate Seattle’s daily minimum on August 28, 2026, will most likely fall in the mid-to-upper 50s °F.** Overnight conditions feature light winds, increasing cloud cover, and a chance of light rain or drizzle after midnight, which limits radiative cooling and keeps temperatures from dropping sharply. Current evening readings near 60–64 °F and guidance for lows around 55–60 °F (mid- to upper-50s in most runs) create a narrow, closely contested range. This produces balanced market probabilities across the 54–61 °F bins, as small differences in cloud timing, wind speed, or marine-layer influence can shift the exact minimum by 2–4 °F. Historical climatology (average low ~56 °F) and recent model consensus reinforce the tight distribution while underscoring the uncertainty that keeps no single outcome dominant.