El Niño is a natural weather event that affects global weather patterns. An El Niño starts when the surface of the Pacific Ocean becomes warmer than usual. This results in the formation of storms that affect global weather. The storms cause unusually wet weather in some parts of the world.

The unusually wet weather in one place is offset by unusually dry weather elsewhere. El Niño affects more than just rainfall. It also has a great impact on temperature. Some areas experience mild weather while other areas are unusually hot or cold.