**Trader sentiment for the lowest temperature in London on June 16, 2026, centers on 14–15 °C as the most probable outcomes, reflecting current forecast guidance that points toward a minimum near or slightly below the seasonal average.** Recent Met Office forecasts indicate a daytime high of 26 °C and overnight low of 16 °C under mostly dry, settled conditions driven by high pressure. This setup favors radiative cooling after sunset when skies remain clear and winds stay light, allowing surface temperatures to drop efficiently. Ensemble models from the Met Office and ECMWF show a spread that includes values around 14–15 °C, accounting for uncertainty in exact cloud cover, residual moisture, or slight increases in wind that could limit overnight cooling. Climatologically, London’s mid-June average minimum sits near 12–14 °C, so the market-implied probabilities around 14–15 °C align with a modest warm bias relative to long-term norms while incorporating the range of possible model outcomes. Higher probabilities on 15 °C (44 %) versus 16 °C (16 %) suggest traders are weighting cooler ensemble members or anticipating minor forecast adjustments as new runs become available. Lower outcomes below 13 °C or above 17 °C carry minimal implied odds consistent with the limited historical frequency of extremes under the current high-pressure regime. Key upcoming drivers include updated model guidance and any shifts in cloud or wind forecasts over the next 48 hours, which could narrow the distribution and move probabilities.