When the westerlies blow over the pacific ocean towards the coast is the air in them moist or dry explain?

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Any air in contact with warm water will generally have a high moisture content by the time it reaches land fall.

The wind holds moisture from it evaporating off the ocean.
This will bring in higher humidity and usually cooler weather. Depends on if the winds come from the north or south. The south will be warmer because its closer to the tropics.