Forecast models from the National Weather Service and private outlets show Seattle's overnight low for August 28 converging on the mid-to-upper 50s, with 56–59 °F bins holding the largest share of market-implied odds due to tight clustering in guidance. Radiative cooling under partly to mostly cloudy skies, light variable winds, and a strengthening marine layer are the dominant factors limiting further drops below 56 °F while also capping how high the minimum can climb. A slight chance of showers adds modest uncertainty, as additional moisture and cloud cover could reduce overnight temperature falls by a degree or two relative to drier scenarios. Recent clearing on August 27 and stable high pressure have kept current conditions near seasonal norms, leaving the precise minimum sensitive to small shifts in the evening wind field and cloud timing ahead of the next data releases.