Temperatures in the Anglia region reached 26°C (79°F) on Monday making it the warmest part of the British Isles.
The long-term average maximum temperature for East Anglia in September is 19°C so it was 7°C above normal.
The hottest places were Cambridge and Santon Downham on the Suffolk-Norfolk border.
Temperatures will remain above average for the next few days with tropical air from ex-Hurricane Helene flooding into the south of the country.
Maximum temperatures in the Anglia region on Monday 17 September 2018
- 26.0°C in Cambridge
- 26.0°C in Santon Downham, Suffolk
- 25.9°C at Monks Wood near Sawtry, Cambridgeshire
- 25.9°C in Weybourne, Norfolk
- 25.8°C in Writtle, Essex
- 25.6°C in Marham, Norfolk
- 25.5°C in Thurleigh, Bedfordshire
- 25.3°C in Cavendish, Suffolk
- 25.1°C in Cromer, Norfolk
- 25.0°C in Woburn, Bedfordshire
- 24.9°C in Andrewsfield, Essex
- 24.9°C in Tibenham, Norfolk
- 24.9°C in Wittering, Cambridgeshire
- 24.6°C at Houghton Hall in Norfolk
- 24.6°C in Shoeburyness, Essex
- 24.5°C in Holbeach, Lincolnshire
- 24.2°C in Harpenden, Hertfordshire
- 24.2°C in Stowe, Buckinghamshire
- 24.1°C in Wattisham, Suffolk
- 23.3°C in Charsfield, Suffolk
The highest temperature ever recorded in the UK in September was 35.6°C (96°F) on 2 September 1906 in Bawtry in South Yorkshire.
A maximum temperature of 34.6°C (94.2°F) was recorded at Raunds in Northamptonshire on 8 September 1911.