During the rainy season, temperatures will tend to be a little cooler. In places where high pressure dominates year round, temperatures only change slightly. This slight change is due to the earth's tilt. The earth's tilt causes precipitation patterns to change throughout the year. In the Northern Hemisphere summer, the ITCZ moves further north and hurricanes become prevalent.
Weather systems move from east to west in the tropics.
Hurricanes and thunderstorm complexes generally drift toward the west. There are exceptions to this rule, especially as tropical systems move into higher latitudes. In these cases they will be picked up by the westerlies. There are six widely accepted conditions for hurricane development. Below this threshold temperature, hurricanes will not form or will weaken rapidly once they move over water below this threshold.