In the eastern Pacific, where El Niño tends to strengthen hurricane activity, the season has been very active so far.
There have been 22 named storms and 12 hurricanes, including 10 major hurricanes.
This is already above the number that would usually occur over the course of an average season, with two months to go.
Here, El Niño provides the ingredients for warmer ocean temperatures and weaker winds in the upper atmospheres, making it easier for storms to build strength.
Hurricane Polo is an example.
The hurricane intensified rapidly, producing wind gusts of 285 km/h, fueled by very warm waters produced by El Niño.
Polo was also one of three hurricanes moving through the same basin at the same time, along with Odalys and Nolo.
This has already happened twice in the space of a month.
Earlier in September, energy produced by exceptional ocean heat caused three simultaneous hurricanes in the central and eastern Pacific: Lowell, Karina and Marie.
Until this year, the last time there were three hurricanes in the Pacific at the same time was in 2015.
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