Webthe average sea water temperature in june of 2024 was 79. 8°f. The highest and lowest sea temperatures during the month were 84. 2°f and 75. 4°f. Sunny, partly cloudy and. Webbest time to swim in myrtle beach: The water temperature by month. Do you feel like swimming in myrtle beach in the united states (usa)? Discover the average sea. Webaverage water temperature in myrtle beach in june is 78. 8°f and therefore suitable for comfortable swimming. The warmest sea in myrtle beach in june is 84°f, and the coldest is 71. 1°f. Average high air temperature in myrtle beach in june is 85°f, and average low. In recent years, at the beginning of the month, the temperature value here is at around 75°f, and. Webaverage water temperature in myrtle beach for june the average, high, and low temperatures below should help you if you can swim in the water in myrtle beach in. Webthe average surface water temperature in myrtle beach is increasing during june, rising by 5°f, from 76°f to 81°f, over the course of the month.