Olathe, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Olathe is not typically known for travel and beach tourism. The best time to travel to Olathe, United States, is in May when the average air temperature is around 70°F (21°C) and water temperature is not applicable as it is not a coastal city. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!