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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.
Mean annual temperatures across the State range from 54.0 Â° F in northern New Castle County to 58.1 Â° F along the Atlantic coast of southern Delaware.Average annual precipitation is approximately 45â statewide.ven so, the State has a continental climate, with cold winter temperatures, hot summers and ample precipitation throughout the year. However, annual precipitation amounts can vary greatly from one year to another.