Seattle's late-August marine climate, moderated by Puget Sound and Pacific onshore flow, typically produces overnight lows near the long-term average of 56°F, with recent model consensus and station observations pointing to 56–58°F for August 26 amid mostly clear to partly cloudy skies and light winds. Minor differences between the leading 56–57°F and 58–59°F bins stem from forecast uncertainty in nocturnal radiative cooling rates and boundary-layer mixing, which can shift the daily minimum by 1–2°F depending on exact cloud timing or local urban effects. Traders are weighting these narrow ranges most heavily because ensemble guidance shows limited deviation potential absent an unexpected frontal passage.