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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.
Average ocean temperatures for the mid-Atlantic coast, from Virginia to Delaware, are listed below for each month in degrees Fahrenheit and degrees Celsius. Along this stretch of ocean beaches, the water averages above 70 Â°F (21 Â°C) during the summer.