The county is set to be quite chilly today, with most areas peaking at 9 degrees Celsius before dropping to six overnight, the Met Office said.
Chichester and Worthing will start with sunny intervals changing to cloudy by lunchtime while Horsham will be overcast.
Brighton will be cloudy with Eastbourne starting misty before changing to overcast by lunchtime,
Hastings will also start misty changing to cloudy by lunchtime and will be slightly warmer overnight, only dropping to 7 degrees Celsius.