Observation of ocean waves is one of the important meteorological observations made to support marine safety. The cause of wave variation in Indonesia is influenced by several wind-related weather phenomena. Cold Surge and CENS are examples of weather phenomena that have an effects on the significant wave heights in the region it passes. This study was conducted to see the impacts of Cold Surge and CENS on the significant wave height in Natuna Sea on December 2014 - February 2015. The data used are 925 hPa layer wind data to detect Cold Surge and CENS, as well as hindcast data output from Wavewatch- III to simulate wave conditions during Cold Surge and CENS events. The results showed that Cold Surge phenomena was more dominant than CENS. The significant wave height in Natuna Sea, during CENS incident was higher than during the cold surge incident. The wave heights during the cold surge ranged from 0.2 m - 1.8 m, while the wave height at the CENS incidence ranged from 0.3 m - 2.8 m.