cabo water temperature
1 Annual average water temperature: 24ÂºC (75ÂºF) . 2  During the summer months the water temperature can reach the mid-80ÂºF's (28 - 29ÂºC). 3  Expect water temperatures on the Pacific side of Cabo San Lucas to be between 5ÂºF and 10ÂºF lower (2.7 to 5.5ÂºC) compared to the Sea of Cortez. During the summer months the water temperature can reach the mid-80ÂºF's (28 - 29ÂºC). 2  Expect water temperatures on the Pacific side of Cabo San Lucas to be between 5ÂºF and 10ÂºF lower (2.7 to 5.5ÂºC) compared to the Sea of Cortez.