Jaffrey, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Jaffrey is known for Mount Monadnock, a popular hiking destination. The best time to travel to Jaffrey, United States, is in late spring (May to June) when the average air temperature is around 60-70°F and water temperature in nearby lakes is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!