This village appears in historical documents from 1310. A census in 1582 and 1583 recorded eight farms in the village, while a 1731 census conducted by the Dundaga Estate found only three. In 1826, each farm had 16 or 17 people, with some 60 in total. A census in 1935 showed that all 49 Livonians in Saunags spoke the Lithuanian language, but only 11 of them spoke the language at home. There was a store that was owned by Kārlis Tilmanis, who also owned a factory where sprats were salted. Also born in Saunags was the seafaring captain Arvīds Ludeviks (1912-1996). In May 1945, he captained a tugboat, the Rota, in an attempt to bring Latvian refugees to Sweden. The ship was detained, and the captain was sent to Siberia. Another seafaring captain from Saunags was Visvaldis Feldmanis (1938-2017).