The best month to visit Prince Edward Island (PEI) is undoubtedly August. During this time, the island is in full bloom, and the weather is at its absolute warmest, with average highs of 23°C (73°F), perfect for enjoying the famous red-sand beaches and the warm waters of the Northumberland Strait. August is also the peak of the "bounty" season, where you can enjoy the freshest local seafood, including world-renowned Malpeque oysters and PEI mussels. All major attractions, from the Anne of Green Gables Heritage Place to the Charlottetown Festival, are fully operational and hosting vibrant events. For those who prefer fewer crowds, September is an excellent alternative, offering "Indian Summer" weather and the start of the harvest season, including the Fall Flavours Festival. However, for the quintessential "Island Summer" experience—with lush green landscapes, clear blue skies, and the maximum number of daily outdoor activities—August remains the "gold standard" for a visit to Canada's smallest and most charming province.