Quinuna is the fifth month of the year in the Vetus calendar, and consists of five nine-day weeks.

Quinuna begins (astrologically) with the sun in the sign of Clavis and ends in the sign of Flamma. Astronomically speaking, the sun begins in the constellation of Sapiens and ends in the constellation of Clavis.

Quinuna is Archaic for "fifth moon," because the months in the Vetus calendar are lunar, and Quinuna marks the fifth moon phase for the year.

Seasonally, Quinuna is the start of summer for those in the northern hemisphere, and the start of winter for those in the southern hemisphere. It is preceded by Quatuna and succeeded by Zexuna.