Experts say the weather pattern is likely to persist until next February.
The World Meteorological Organisation is warning El Nino is rapidly strengthening in the Pacific and could become a very strong event by the end of the year.
Experts say the weather pattern will most likely last into next February, increasing the risk of flooding, drought and extreme heat.
The WMO says almost all land areas will experience above-normal temperatures and it's the first time ever their forecast has been 'so unequivocal.'
El Nino happens when certain sea temperatures rise above normal, affecting weather worldwide.
Offaly Climate scientist and meteorologist Cathal Nolan says it's likely to be unprecedented:
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