According to the United States Census Bureau, the town has a total area of 36.3 sq mi (94.0 km2), all land.
Quartzsite lies on the western portion of the La Posa Plain along Tyson Wash. The Dome Rock Mountains overlook the town on the west with Granite Mountain on the southwest edge of the town and Oldman Mountain on the northwest. The Plomosa Mountains lie across the La Posa Plain to the east.[4] The town has a hot desert climate (Köppen BWh) with mild to warm winters from November to March and hot to extreme summers for the rest of the year. In the middle of summer, Quartzsite is one of the hottest places in the United States and has recorded temperatures as high as 122 °F (50.0 °C) on 28 July of 1995.
There is very little precipitation: only 3.51 inches (89.2 mm) falls in an average year and in May and June more than 80 percent of years do not record measurable rainfall. Since records began in 1928 the wettest month has been September 1939 with 6.16 inches (156.5 mm), part of the wettest year with 11.05 inches (280.7 mm) and featuring on 5 September the wettest day with 3.00 inches (76.2 mm) from the remnants of a rare Gulf of California hurricane.[5] The driest calendar year has been 1928 with 0.92 inches (23.4 mm), though between July 2001 and August 2002 as little as 0.45 inches (11.4 mm) fell over fourteen months.
