Yes, January is a good time for sunbathing in Rainbow Bay Beach.
January has average maximum temperatures of 28°C (82°F) which is very warm and perfect for sunbathing on clear days. The sunshine percentage is 45% making it quite sunny but with regular periods of cloudy and overcast skies. There are 6.2 hours of sunshine per day.
January has total rainfall of 18.9cm (7.4inches) making it often dry with only moderate showers. There are only 11.1 days with some rainfall so you can still enjoy the beach on the many clear days.
More about January temperature and sunshine.