Allendale, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Allendale, New Jersey, United States, is known for its picturesque Celery Farm, a 107-acre nature preserve popular for birdwatching and hiking. The best time to travel to Allendale, United States, is in late spring or early fall when the average air temperature is around 60-70°F, though water temperatures are not a significant factor as Allendale is inland. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!