The best time to go to Greenwich, Prince Edward Island, is generally from late June to early September.This period offers the warmest weather, with average daily temperatures ranging from 18°C to 25°C, making it ideal for enjoying the outdoors. The days are long, and the waters of the Gulf of St. Lawrence are warm enough for swimming by mid-July. This is also when all the local attractions, restaurants, and shops are fully open and operating on extended hours.For those looking for a quieter experience with pleasant weather and fewer crowds, late May to early June or mid-September to early October can also be lovely. You'll still find many attractions open, and the autumn colours towards the end of the season are quite beautiful, especially around the Greenwich National Park trails.