With roughly 50 mm of rain already recorded at London sites like Kew Gardens by early June—exceeding the long-term climatological average of 43–50 mm for the full month—trader sentiment clusters around 50–80 mm totals because unsettled Atlantic low-pressure systems and a variable jet stream have driven frequent showers through mid-month. Remaining forecast uncertainty stems from diverging model runs on whether high pressure will build to suppress further rainfall or persistent cyclonic flow delivers additional accumulations of 20–40 mm over the final two weeks. Official Met Office guidance highlights elevated chances of average-to-wetter conditions relative to drier long-range outlooks, keeping the 50–70 mm bins narrowly ahead while the sub-40 mm and 80 mm+ tails reflect the wide spread in possible outcomes from steering patterns and convective intensity.