It is also likely to finish in the top five warmest, with UK mean temperatures significantly above the monthly average.
Exceptionally low rainfall in September
Using figures from 1-28 September, the UK as a whole has received just 20 per cent of the normal amount of rainfall we'd expect for the month. Prior to this, the driest September on record was in 1959.
Looking at individual countries, Northern Ireland should break the record for September dryness with just 7 per cent of the average. However, England, Wales and Scotland are likely to have their second driest September on record, with earlier records being set in 1959 and 1972 respectively.
Dry month in a wet year
This September follows on from the 8th wettest August on record and comes in a generally very wet year - this January to August is the wettest such period in the records, mainly as a result of the very wet start to the year and the wettest winter on record.
Trevor Bishop, Environment Agency deputy director of water resources, said: "Following the wettest January to August on record, water resources in England are around normal for the time of year.
"We also look ahead by modelling how rivers and groundwater may respond to different future rainfall patterns. The results show a broadly positive picture and even if rainfall is below average this autumnthe country will not go into drought."