Provisional Met Office data confirm summer 2026 as the UK's warmest on record, with a June–August mean temperature of 16.5°C—0.4°C above the 2025 record and 1.9°C above the 1991–2020 average. Multiple heatwaves produced nine days above 35°C and 55 days above 28°C, both new benchmarks, alongside a seasonal peak of 38.2°C. Human-induced climate change increased the likelihood of such warmth by roughly 130 times relative to pre-industrial conditions, consistent with the long-term upward trend in which the five hottest summers have all occurred since 2003. Full verification of station data remains pending, yet any adjustments are unlikely to alter the ranking given the margin over prior records.