Official forecasts from the UK Met Office indicate a daytime maximum of 19°C in London on June 5 under partly cloudy skies with light winds, aligning with the market's near-certain consensus. This reflects typical early-summer conditions following May's warmer anomalies, with model runs showing limited variability around this value and no significant warm-air advection or clear-sky intensification expected. Historical June averages near 21°C provide context, yet current steering patterns and overnight lows around 12°C constrain the peak. Resolution depends on official Met Office observations meeting the exact daily high threshold; any last-minute cloud cover or wind shifts could introduce minor downward revisions, though probabilities remain low given the convergence of guidance.