Recent Met Office and BBC forecasts for London indicate an overnight minimum near 13°C on June 14, driven by mild northwesterly flow under generally clear to partly cloudy skies that limit radiational cooling. Model consensus from European and UK sources aligns closely on this threshold, consistent with seasonal baselines where June nighttime lows average 11–12°C but current synoptic conditions support a slightly warmer floor. Trader consensus at 99.2% on 13°C reflects high confidence in these guidance products resolving exactly at that level, with resolution likely hinging on official observations from sites such as Heathrow or St James’s Park. Unlikely shifts in cloud cover or frontal timing could push the reading to 12°C or 14°C, though ensemble spreads remain narrow this close to the overnight period.