San Mateo Ixtatán is a municipality in the Guatemalan department of Huehuetenango. It is situated at 2,540 metres (8,330 ft) above sea level in the Cuchumatanes mountain range and covers 560 square kilometres (220 sq mi) of terrain. It has a cold climate and is located in a cloud forest. The temperature fluctuates between 0.5 and 20 °C (32.9 and 68.0 °F). The coldest months are from November to January and the warmest months are April and May. The town has a population of about 10,000, and is the municipal center for an additional 20,000 people living in the surrounding mountain villages. It has a weekly market on Thursday and Sunday. The annual town festival takes place from September 19 to September 21 honoring their patron Saint Matthew.