One reason for increased activity is a weather cycle called the Madden-Julian Oscillation (MJO). In the tropical zone where hurricanes form above and below the equator. The MJO is a cycle between a phase enhancing the formation of rainstorms and thunderstorms and a phase diminishing them. These phases move eastward taking anywhere from one to two months to go from one to the other. Below is a week to week chart of the current MJO.
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Dates are along the right side of the chart. We are on the right side too, but just off the chart above Cuba since we are not in this zone tropical convergence zone where there are no cold fronts of low pressure bringing storms as in the US but rather tropical waves of low pressure thunderstorm formation moving along where hurricanes are most likely to form if conditions are right.