It has a humid subtropical climate with mild summers and cold winters, experiencing occasional storms and nor'easters. The area is surrounded by beaches and has a diverse hydrology system, including small ponds and wetlands. Outdoor recreation opportunities in Amagansett include surfing, hiking, biking, fishing, and birdwatching. The hamlet is home to several nature reserves and parks, including the Amagansett National Wildlife Refuge and the Atlantic Double Dunes Preserve, which offer opportunities for visitors to explore the local flora and fauna. The area is known for its beautiful beaches and scenic landscapes, making it a popular destination for tourists and locals alike.
Amagansett receives approximately 1173mm of rain per year, with humidity levels near 79% and air temperatures averaging around 11°C. Amagansett has a plant hardyness factor of 7, meaning plants and agriculture in this region tend to thrive during the non-winter months.