Williamstown holiday rentals are £181/night on average. However, you may find that prices fluctuate depending on the time of year. For example, June is the most expensive month to book a holiday rental in Williamstown, and August is often the cheapest month to book. Recently, our users found rentals for £112/night - which is currently the cheapest price. Keep in mind that anything £163/night or less is still considered a good deal.