The county is set for mild weather today starting off cloudy and overcast, according to the Met Office.
But the forecast is set to brighten up later in the day with some sunny periods.
Horsham will reach a high of 19 degrees Celsius, dropping to 13 overnight.
Chichester, Worthing and Eastbourne will reach 18 degrees while Brighton and Hastings will reach 17.
Overnight Worthing and Hastings will drop to 13, Eastbourne and Brighton to 12 and Chichester to 11 degrees Celsius.
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