Glenbrook, New Zealand offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Glenbrook is known for the Glenbrook Vintage Railway, a popular heritage steam railway attraction. The best time to travel to Glenbrook, New Zealand, is during the summer months of December to February, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!