Las Vegas' climate is an arid desert climate, typical of the Mojave Desert in which it lies. The city enjoys abundant sunshine year-round and has about an average of 300 sunshine days a year, with very little rainfall.

The summer months of June through September are very hot and mostly dry with average daytime highs of 94 °F (34 °C)-104 °F (40 °C) and nighttime lows of 69 °F (21 °C)-78 °F (26 °C); and most days in July and August exceed 100 °F (38 °C) but with very low humidity, frequently under 10%.

Las Vegas' winters are of short duration and the season is generally mild, with daytime highs near 60 °F (16 °C) and nighttime lows around 40 °F (4 °C). The mountains surrounding Las Vegas accumulate snow during the winter but snow is rare in the Las Vegas Valley itself. Several years apart, however, snow has fallen in the valley. Temperatures can sometimes drop to freezing 32 °F (0 °C) but winter nighttime temperatures will rarely dip below 30 degrees.