Myrtle Beach average temperature in day time in March is 68 F and average ocean temperature is 56 F. Humidity is really bad in summer time, but in spring you not gonna feel that much, should be fine. Average at least 4 days a week it s sunny. Also in spring time a lot of windy days. Myrtle Beach starts to be a little bit busy in March and the busiest time in spring is one week before Easter and one week after Easter, so if you planning to come around Easter you should book a hotel earlier, but even if you don t it so many hotels and motels here I believe you will be able to find something. You can always check Myrtle Beach weather on this local forecast http://www.myrtlebeachbay.com/myrtle-bea��
By mid March, the average high is in the upper 60s! The weather is very mild that time of year and very comfortable. I would bring a jacket and some sweaters to wear in the evening. Not too much humidity that time of year. And remember, there are lots of resorts with heated indoor pools and lazy rivers. Check out http://www.myrtlebeachhotels.com for more information. Enjoy!
Low 60 s to mid 70 s water too cold to swim in, good chance of sun but plan on at least 2 days of rain during the week. There is always humidity at Myrtle, probably not real bad 60-70%. Usually a big crowd for spring break with a few parties going on either on or close to the beach and reserve your rooms now, because Myrtle Beach is a big spring break town, most of the east coast colleges from UV to Duke plan a trip there for spring break.