Ömnögovi (Mongolian: Өмнөговь, romanized: Ömnögowĭ) is a sum (district) of Uvs Province in western Mongolia.
Part of the sum is desert, that has sand dunes.
Ömnögovi has a semi-arid climate (Köppen climate classification BSk) with warm summers and severely cold winters. The average minimum temperature in January is −28.3 °C (−18.9 °F), and temperatures as low as −45.5 °C (−49.9 °F) have been recorded. Most precipitation falls in the summer as rain, with some snow in the adjacent months of May and September. Winters are very dry.