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Bethany Beach, DE Weather. The average temperature of Bethany Beach is 56.48Â°F, which is higher than the Delaware average temperature of 54.48Â°F and is higher than the national average temperature of 54.45Â°F. Historical Weather.
Weather & Average Temperatures. The weather in Bethany Beach is a combination of bright sunny days tempered by gentle ocean breezes. The area enjoys around 200 sunny days each year, with a year-round average hovering around 70Â°. Check the following local weather conditions and average air and water temps for Bethany Beach, Delaware.