 Here's the marine forecast from the Tock of Delmarva Weather Center. Excessive heat warning this afternoon with isolated storms possible. High of 96. Current water temperature at 68.7. A small craft advisory continues for today. South winds 15 to 20 knots. Seas of 3 to 5 feet. For Rehoboth Beach, low tide 232 p.m. High tide 908 p.m. Low tide 334 a.m. For Cambridge, high tide 505 p.m. Low tide 1126 p.m. High tide 542 a.m. tomorrow.