The highest average temperature in Dana Point is August at 71.7 degrees. The coldest average temperature in Dana Point is December at 55.7 degrees.The most monthly precipitation in Dana Point occurs in February with 2.6 inches. The Dana Point weather information is based on the average of the previous 3-7 years of data.he most monthly precipitation in Dana Point occurs in February with 2.6 inches. The Dana Point weather information is based on the average of the previous 3-7 years of data.