Marcelo Rebelo de Sousa arrived in Gustine Sunday afternoon.
It's the first time a sitting president from another country has visited the city.
President de Sousa took part in a meet and greet with invited guests and was presented with a key to the city.
Members of the public gathered around the Gustine Pentecost Society Hall to see his arrival.
Gustine was founded as a Portuguese dairy community and is home to the largest Portuguese Festa celebrations in the Western US.