April brings a transition from the dry to the wet season in United States Virgin Islands. The extended dry periods give way to intermittent patches of moderate precipitation. The average rainfall rises to 2.7" (69mm) as the skies become partly cloudy. Day temperatures hit 87°F (30.6°C), while nights are cozy and mostly remain below 74°F (23.3°C). Saint John's is a little cooler than the southern island of Saint Croix. Seawater temperatures are mild at an average of 81°F (27.2°C). The calm waters of Trunk Bay on Saint John are perfect for youngsters to snorkel through the Underwater Trail of coral and fish. The islands are hilly and have plenty of forest cover that draws adventurers to the interior, away from the coast. Expect showers during the afternoons. The United States Virgin Islands have pleasant weather in April, but see fewer crowds than the peak tourist season.