Trader consensus on Polymarket tilts toward a lowest temperature of 7°C (35%) or 6°C (28%) in London today, driven by the latest Met Office and BBC Weather forecasts showing nighttime minimums of 5–7°C at key stations like Heathrow amid persistent overcast skies and light showers. Cool northwesterly winds at 7–9 mph limit daytime warming to around 14°C while moderating nocturnal radiative cooling, with hourly models indicating early morning lows near 6–7°C but varying by 1–2°C due to cloud cover fluctuations and precipitation timing. This genuine uncertainty in exact integer-degree outcomes reflects divergent model runs on low-level clearing; official observations from Heathrow—London's standard reference—will resolve the market by midnight, potentially shifting with any evening clearance. Below-average May conditions stem from a blocking high steering cooler Atlantic air southward.