Is the El Nino still in effect? If so, how much longer will it affect the weather?

El Nino was originally recognized by fishermen off the coast of South America in the late 1800's as the appearance of abnormally warm water in the Pacific Ocean, which usually arrived shortly after the beginning of the year. This localized phenomenon is now known to be part of a very large and complex system of atmospheric and oceanic interactions. El Nino is a disruption of the ocean-atmosphere system in the tropical Pacific.

La nina, the "sister" of El Nino, is now in effect.

Here's how it works: normally, trade winds blow from east to west,
causing a backup of warm surface water in the western Pacific so that
the sea surface is about half a meter higher at Indonesia than at
Ecuador. To replace the water which has been blown to the west, cold
nutrient-rich water rises up from the depths along the coast of South
America. This nutrient-rich water supports a diversity of marine life,
and, in turn, supports the fisherman in South America.

Every four years or so an El Nino event takes place. These trade winds
relax and the water that once "backed up" in the western Pacific sloshes
back toward the west, causing the end of the nutrient-rich upwelled
coastal water.

La nina, with its strong east-to-west trade winds, causes exceptionally
heavy rainfall in usually rainy areas near the western Pacific, and very
dry weather in usually dry areas near the eastern Pacific. The average
La nina winter is slightly wetter and cooler, but there are many
examples of La nina winters that were warmer and drier, so it is hard to
predict the impact.

Here in Texas, it has been warmer and drier!