Webmyrtle beach, horry county water and sea temperatures for today, this week, this month and this year. Websep 30, 2024 · weather for myrtle beach, south carolina. Wsw 4. 5 mph. Web4 days ago · weather for myrtle beach, south carolina. E 2. 7 mph. 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. Webmyrtle beach (the yachtsman pier) sea temperatures peak in the range 27 to 29°c (81 to 84°f) on around the 23rd of july and are at their minimum on about the 4th of march, in.