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A yellow weather warning has been introduced, with thunderstorms and heavy rain expected this evening.
Two-thirds of the county is covered by the Met Office's warning which runs until 2am tomorrow.
Maidstone, Canterbury, Ashford and Thanet are among the boroughs and districts covered by the caution.
Weather experts say driving conditions could be affected by spray, standing water and even hail.
There may also be delays to train services, power cuts, flooding and lightning strikes.
While recent days have been wet, the driest parts of the UK need to see rainfall at “more than record-breaking” levels this autumn to recover from the joint hottest summer on record, the Met Office says.
Southern England still needs more than 400mm of rainfall to reach the average amount of rain for the year, which would require the region to experience the wettest autumn ever.
Almost a third of the average amount of rain expected for the month of September in the south has fallen in just six days - however, it is not enough.
So far, 2022 has been the driest since 1976.