Recent low precipitation totals in London through mid-May, with only around 5 mm recorded so far against a historical average of 46–57 mm, have anchored trader sentiment around the 10–20 mm range. This dry start stems from a persistent high-pressure influence over southern England that has limited Atlantic frontal systems and associated rainfall, consistent with variable spring patterns where the jet stream position controls the frequency of low-pressure systems crossing the UK. Official Met Office monitoring shows London on track for well below-normal May accumulation unless a shift to westerly flow delivers sustained showers in the remaining weeks. Ensemble forecasts highlight uncertainty in late-month storm tracks, with model runs diverging on whether total rainfall will stay under 15 mm or climb toward 25 mm depending on the timing of any Atlantic low-pressure developments.