Seattle's overnight low on August 25 sits near the seasonal average of 56–58°F, with National Weather Service guidance and ensemble models clustering tightly around 56–61°F due to variable boundary-layer moisture and light northerly winds that modulate radiational cooling. Clear skies would favor stronger surface cooling toward the lower end of that range, while increased cloud cover or a subtle marine layer intrusion—common in the Pacific Northwest—could limit the drop and push readings toward 60°F. Trader probabilities remain closely split across the top three bins because small forecast shifts in dew points or wind speed can easily move the minimum by 1–2°F, with resolution hinging on official observations from Seattle stations once the calendar day ends.