Weir is a city in Cherokee County, Kansas, United States.

[4] It is named after landowner T. M. Weir, who donated forty acres as a townsite.

[9] Weir is, in large part undermined at a depth of about 30 feet where coal was mined from a 4 foot thick vein.

In 1899, more than 200 African-American miners traveled to Weir from Pana, Illinois, after being attacked by white union members in what was called the Pana riot during a coal mining strike.

[10] According to the United States Census Bureau, the city has a total area of 0.94 square miles (2.43 km2), all of it land.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

Of all households 26.3% were made up of individuals, and 10.6% had someone living alone who was 65 years of age or older.

Of all households 25.5% were made up of individuals, and 13.5% had someone living alone who was 65 years of age or older.