La Niña’s return could affect fall and winter weather in IndianaINDIANAPOLIS (WISH) — Fall began this week, but the U.S. Climate Prediction Center is already giving some hints of what to expect in the coming months, with La Niña expected to return. The division of the National Weather Service gave a 71% chance of La Niña from October to December. Additionally, there is a 54% chance of La Niña from December 2025 to February 2026. In a La Niña pattern, the jet stream typically cuts through the Ohio River Valley and brings above-average precipitation.