Current forecasts from the UK Met Office indicate a minimum air temperature of 10°C in central London on June 11, driven by clear overnight skies under a stable high-pressure system and light winds that limit mixing with warmer air aloft. Multiple numerical weather prediction models align on this value, consistent with climatological June lows near 11–13°C yet tempered by recent cooler maritime airflow. Traders assign 98.3% implied probability to exactly 10°C because official resolution relies on verified Met Office station data with narrow uncertainty bands. A modest shift could occur only if localized urban heat-island effects or revised post-event measurements push the recorded low outside the 10°C threshold.