Clear skies and light winds under persistent high pressure are positioning San Francisco's minimum temperature on October 15 near the mid-50s°F, aligning with National Weather Service forecasts of 52–55°F overnight lows. Radiative cooling under dry, calm conditions with minimal cloud cover and northeast flow supports efficient heat loss after daytime highs near 75–80°F, consistent with typical early-autumn patterns where average lows reach about 55°F. Market-implied odds favoring 64°F or higher at 49% alongside clustered probabilities in the 52–63°F range reflect trader consensus on these stable atmospheric conditions, with low odds below 45°F underscoring the absence of stronger onshore flow or marine intrusions that could depress readings further. Updated model runs through the evening will refine any late adjustments ahead of resolution.