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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.
1 Record Coldest year in Delaware - 1904 / Avg temperature 51.35 degrees. 2  Delaware average Summer temperature (June, July, August) - 74.2 F degrees, 16th warmest U.S. summer state.3  Delaware average Winter temperature (December, January, February) - 36.1 F degrees, 34th coldest U.S. winter state.eptember has an average of one to two days per year with a maximum temperature of 90 F or higher. The average number of days per year with a minimum temperature of 32 F or lower varies from 90 to 100 days for coastal locations to 100 to 110 days at inland points. Temperatures of 0 F or lower occur in the winter months.