60s. You'll need to start dressing in layers as soon as the temperature dips below 70 degrees. Beach weather in the mid-60s can change in an instant depending on cloud cover and wind speeds.
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The average temperature of the sea surface is about 20° C (68° F), but it ranges from more than 30° C (86° F) in warm tropical regions to less than 0°C at high latitudes. In most of the ocean, the water becomes colder with increasing depth.
Water takes a lot more energy to heat up and cool down than land does. Because of this, our summers are always cooler right at the beaches, and our winters are typically warmer.