How Does the Weather at Myrtle Beach Change Through the Year? Air and Sea Temperature, Rain, Daylight, Snow and Tropical Cyclones at the Grand Strand Compared with 20 US Beaches, from NOAA Climate Normals 1991–2020, OISST, HURDAT2 and NWS Records, 19

Beach travel is planned by month, yet air temperature, sea temperature, rain and storm risk follow different seasonal calendars. We describe the monthly climate of Myrtle Beach, South Carolina, from the NOAA 1991–2020 US Climate Normals, the NOAA OISST v2.1 1991–2020 monthly mean sea surface temperature, the National Weather Service Myrtle Beach snowfall database and the HURDAT2 best-track record, and compare it with 16 other air stations and 20 other sea-temperature points on the Atlantic, Gulf and Pacific coasts. The normal daily high rose from 55.7°F in January to 87.6°F in July, with 20.9 days a year at 90°F or hotter and 33.8 nights at 32°F or colder. The sea lagged the air by about a month, from 59.5°F in February to 82.3°F in August, and averaged 70°F or more in six months, May to October. Precipitation totalled 48.47 inches, peaking at 6.65 inches in September. Among the beaches compared, January means spanned 26.5°F while July highs at the 11 East and Gulf Coast stations lay within 4.2°F, and the number of months with sea temperature of at least 70°F ranged from 0 in California and New Hampshire to 12 in South Florida and Waikiki. Myrtle Beach recorded 87.4 inches of snow in 36 snowfalls from 1940 to February 2026, and 26 tropical storms and hurricanes passed within 50 miles from 1950 to 2025, one every 2.9 years, 8 of them in September. All inputs are public.