Why does the Caribbean side of Honduras receive more rainfall than the Pacific side?

The Caribbean side of Honduras receives significantly more rainfall than the Pacific side primarily due to the influence of prevailing winds and the country's mountainous topography.

The region is subject to prevailing winds that blow from the northeast, carrying warm, moisture-laden air from the Caribbean Sea toward the land. As this moist air encounters the country's interior mountain ranges, it is forced to rise, cool, and condense, resulting in orographic precipitation on the windward (Caribbean) slopes.12

By the time these air masses cross the mountains and descend toward the Pacific coast, they have lost much of their moisture. Consequently, the Pacific side of the country sits in a relative rain shadow, leading to lower annual precipitation totals and a more pronounced dry season compared to the Caribbean lowlands. While the Caribbean side experiences rainfall throughout much of the year, the Pacific plains and mountain slopes receive little to no rain between December and April.23