**Mild overnight conditions driven by a persistent high-pressure system and warming southerly flow are positioning 16–18°C as the dominant outcomes for London's minimum temperature on August 9, 2026.** Forecasts from multiple sources indicate a continued warming trend through the weekend, with daytime highs reaching 28–30°C under predominantly sunny skies and light winds that limit nocturnal radiative cooling. This setup typically keeps overnight lows elevated relative to August climatological averages of 13–14°C, supporting the market's heavy weighting toward 17°C (46% implied probability) as the most likely minimum. Recent model runs show consistency in this pattern, with no strong signals for cooler northerly air or increased cloud cover that would enhance temperature drops. Traders are also assigning modest probability to 16°C or 18°C, reflecting the narrow uncertainty range in short-range guidance just two days ahead. Resolution will hinge on official Met Office observations, where any deviation from the current mild regime—such as unexpected frontal passage—remains low-probability given the established synoptic setup.