Recent National Weather Service model consensus and ensemble guidance indicate Seattle's overnight low on October 8 will likely settle in the low to mid 50s Fahrenheit under partly cloudy skies, light northerly winds, and modest radiational cooling after a daytime high near 70°F. This atmospheric setup, with dew points in the upper 40s to low 50s and limited moisture, supports the clustered market-implied odds around the 48–55°F bins while capping the probability of deeper cooling. The elevated 43% on 45°F or below captures residual uncertainty from model spread, possible late cloud increases, or microscale variations near the observation site. Final NWS forecast updates and real-time mesonet data tonight will further narrow resolution criteria for this temperature threshold.