Buchegg is a municipality in the district of Bucheggberg, in the canton of Solothurn, Switzerland.

[13] The former municipalities that now make up Buchegg have a total combined area of 22.59 km2 (8.72 sq mi).

[15] The historical population is given in the following chart:[16] The villages of Aetingen, Gossliwil, Hessigkofen, Mühledorf and Tscheppach are part of the Inventory of Swiss Heritage Sites.

The wettest month is August during which time Hessigkofen receives an average of 124 mm (4.9 in) of rain or snow.

The driest month of the year is March with an average of 76 mm (3.0 in) of precipitation over 12.1 days.