London experiences a period of unusually warm weather, with forecasts indicating further increases around the Bank Holiday weekend. One report says Sunday is expected to be the warmest May day on record, reflecting wider expectations of sustained heat across the capital and surrounding areas. Another source notes that temperatures reach 27.4°C at Heathrow on Friday afternoon, describing it as the hottest day of the year so far. It also says temperatures are set to climb further into Bank Holiday Monday, which could become the hottest May day on record.

Together, the reports present a consistent picture: London’s current highs are already elevated for May, and forecasters expect the warmth to intensify over the next several days. The timing of peak conditions is attributed to the Bank Holiday weekend, particularly Sunday and Monday. No additional figures beyond the Heathrow temperature and the expectation of record May warmth are provided in the supplied summaries.