ABC11 Meteorologist Don "Big Weather" Schwenneker said a cold front is also moving in causing the wet day.
"Rain will develop during the morning hours and increase in intensity during the afternoon," he said. "Rainfall amounts of up to an inch are possible."
Temperatures will range from the low 50s to the north to the low 60s in the south.
Schwenneker said the rain will taper off in the evening, but not before residents hear a few rumbles of thunder, especially east of I-95.
Thursday, will be back to sunshine and mild temperatures with highs in the low-to-mid 60s.
However, another cold front will drop through the region and bring much cooler air in for the weekend.