The most popular day for house showings tends to be weekends, particularly Saturdays and Sundays. Many potential buyers have more free time on weekends, making it convenient for them to attend open houses or schedule private showings. Real estate agents often plan open houses on weekends to maximize foot traffic and increase the chances of attracting potential buyers. However, it's essential to keep in mind that the popularity of specific days for showings can vary based on the local real estate market and the preferences of potential buyers in that area.