What does La Niña mean for your weather forecast? NOAA is currently predicting a 57% chance of La Niña this winter, which would mean that the jet stream would be pushed further north when cold water from the bottom of the Pacific Ocean is stirred up due to stronger trade winds. This results in warmer, wetter weather in some areas but cooler, drier weather in others from late December through March. However, rising ocean temperatures mean the effects of this weather phenomenon can be hard to predict.