Clear skies and northerly winds under building upper-level ridging are driving market-implied odds toward a Seattle low of 54–59°F on August 24, with the three leading bins nearly tied as models converge on typical late-summer radiative cooling. Official NWS guidance and ensemble forecasts project an overnight minimum in the mid- to upper 50s following a sunny day with highs in the mid-70s, consistent with August climatology where clear, calm conditions allow temperatures to drop efficiently after sunset. Minor differences in wind speed, boundary-layer mixing, and exact timing of any patchy smoke or marine influence create the narrow spread among 54–55°F, 56–57°F, and 58–59°F outcomes. Updated model runs and the next NWS forecast discussion are the key near-term catalysts that could shift probabilities before the daily minimum is recorded.