The third and very important factor is wind direction. If you have a light East wind, your chances of having good fishing is greater than if the wind is from a Westerly direction. Ocean breezes give you clean, clear water. These breezes seem to bring fish closer to the beach. When the winds are from an Easterly direction, there are less problems with flies on the beach as well.
West winds mean a land breeze.
If you are fishing in one of the State Park areas be sure to take the bug spray along on a West wind. If you do want to fish later into the day because the tide is better, go into one of the state park areas and pay to park and you can fish all day long. The Delaware Seashore State Park is very close to Ocean City, just North of Fenwick Island. Assateague Island is just South of Ocean City. Going west across the Route 50 Bridge, turn left on 611 and you will find the Assateague State and Federal parks which both have fishing areas where you can fish all day.