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Story summary
- The United Kingdom will face a heat spell with temperatures up to 29 °C in late September.
- Heat begins Thursday, September 24, as the South West reaches 27 °C.
- London is forecast at 26 °C Thursday, rising to 27 °C Friday.
- Somerset, south London, Surrey and Cambridgeshire may hit 29 °C over the weekend.
- The Met Office defines a heatwave as three consecutive days with highs between 26 °C and 28 °C.