There are a number of ways to better your chances of finding some good stuff at the beach.
Get there at least 2 hours before low tide. Low tides offer you the opportunity to detect further out; where people were playing in the (heavy) surf or swimming when the tide was higher. Some guys put on wet suits and hunt up to their necks. Not me. I do not swim well and I've been sucked out a couple of times by rip tides (when I was a teenager hangin' out at the beach). Not a good feeling and I'm not about to risk my life for a lousy piece of gold
Watch for negative tides or tides that are abnormally low. This works with the phases of the moon. Much, much more beach is exposed and you can walk out pretty far depending on how low it is. Sometimes it's spooky how far out the tide goes...
Of course during the summer there's mostly fresh drops but there's always something in the sand. It's just buried too deep to find. That's where you have to read the beach. Depending on tides, wind speed and direction the beach can become erroded and form "cuts". These are walls of sand at the high tide mark. The sand has been cut away by the wind and waves and taken out to sea. Of course this improves the possibility of finding some deep goodies that aren't quite as buried anymore.. "channels" can also be formed by wave action; some can be pretty deep. I know of people who track wind speed and direction, along with tides, on a daily basis. They know when they have the best chance to hit the beach.
On the east coast, everyone looks for Nor'easters. These are violent, high wind storms that often do the most damage to the beach. Guaranteed that you'll find a couple of people out at the beach even during the storms... I try when I can. I've also tried to get down there just after the storms but they don't always produce the best conditions for finding stuff. For intance, we had around 2 storms a month or so ago. Tremendous beach errosion after very high tides. Unfortunately, it took all the upper sand away and just re-distributed it further out. So, the primary area for hunting was sanded in; buried in sand. But there are times when the conditions are perfect. Kathy (who posts on here) told me that one storm just buried everything but the other created some really good conditions (and she hit some gold). Of course I tried a different beach that day and conditions were terrible
Sorry for the long winded explanation. I guess I shouldn't have had the double cappuccino after dinner last night
Try the Golden Olde site for tips on hunting the beach. It's really good info.