As you travel from 15°S latitude to 15°N latitude, the most expected change would be the wind direction.
This change is due to the Coriolis effect, which causes moving air and fluids to turn and twist rather than travel in straight lines. In the tropics, this leads to changes in the prevailing wind patterns as you move from the Southern Hemisphere to the Northern Hemisphere. In particular, the trade winds shift, influencing the overall wind direction in these latitudes.