Experimental evidence shows that the average temperature inside most Las Vegas casinos is between 65°F and 70°F (18°C and 21°C).
-MGM Grand: 65°F -Paris Las Vegas: 68°F -Excalibur: 70-71°F -Golden Nugget: 74°F -Gold Coast: 68°F
During summer, a casino’s average 68° temperature can feel exceptionally cold because the temperature outside is much higher.
Casinos are relatively cold, to begin with, so you may feel slightly chilly at all times, be it morning or evening.
If you plan to spend most of your day inside the casino, you should wear something that will protect you from the cold.
Most Las Vegas resorts don’t have an official dress code or claim that the dress code is resort casual, which pretty much means you can dress however you feel most comfortable. You can wear jeans, t-shirts, shorts, jackets, or dresses.