Sussex is set for a sunny and warm day before becoming more overcast in the early evening, according to the Met Office.
There will be some light rain in Chichester with patches elsewhere but for the most part the forecast is dry.
Temperatures will reach a high of 23 degrees Celsius and a low of 14 in Horsham, the forecaster said.
Chichester and Worthing will be slightly cooler in the day, 22 and 21 degrees respectively before falling to 15 degrees overnight.
In the east Hastings will reach 20 degrees, Brighton 19 and Eastbourne 21, each dropping to 15 degrees overnight.
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