The Met Office has issued an amber weather warning for parts of Sussex today.
It has warned that due to heavy downpours some places could see 50-60 mm of rain falling in the space of four to six hours.
In a statement the Met Office said: “Following earlier rainfall some heavy, and perhaps thundery, showers are expected to develop over parts of southeast England this afternoon and into the evening. The showers will then gradually ease later this evening.”
Areas set to be affected include Billingshurst, Horsham, Crawley, Haywards Heath, Uckfield, Heathfield, Crowborough, Battle, Robertsbridge and Rye.
Due to the heavy rain people are being warned there could be a chance of homes and businesses flooding as well as delays and some cancellations to train and bus services.
It may also lead to difficult driving conditions and some road closures, with power cuts and loss of other services to some homes and businesses likely.
The rest of East and West Sussex have been given a yellow weather warning, meaning there is a chance that heavy prolonged rainfall could lead to local flooding and disruption to transport.
Highways England has said it is working closely with the Met Office in monitoring the predicted weather conditions,
Road users are advised to take extra care when travelling in wet conditions: allow plenty of extra time to complete your journey and prior to setting off, check the very latest forecast and road conditions.