Met Office forecasts indicate London's highest temperature on April 15 at 17°C, anchoring trader consensus with 39.5% implied probability on that outcome, as mild southwesterly winds deliver drier intervals amid cloudy skies and scattered light rain. This positioning reflects a sharp cooldown from early April's record 26.6°C heat in Kew Gardens, driven by an advancing Atlantic frontal system introducing heavier afternoon rain and gusts up to 30 mph, which suppress peaks via increased cloud cover and precipitation. Forecasts from BBC Weather align at 17°C with light rain, though model uncertainty allows for 18°C if breaks lengthen or 16°C under persistent overcast—resolution hinges on official observations from Heathrow and central stations by day's end.