i need to expand my answer a little bit more. on a global scale, increasing the temperature of the oceans will increase the absolute humidity (the total amount of water vapor in the atmosphere) but if one increases the amount of water vapor more slowly than the rise in air temperatures, the global average relative humidity could go down.
warmer air has much more ability to hold and suspend water vapor than cool air. the total amount of water vapor divided by the potential capacity based on temperature, expressed as a percentage, is relative humidity.
so had you known the difference between absolute and relative humidity, you could have been partly right, in the manner of a broken clock being right twice a day.
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