SEATTLE — We're on La Niña Watch heading into fall 2025, and even though La Niña is more known for its impacts during the winter season, it can still play a role during autumn as well.

Typically during a La Niña winter the forecast for western Washington calls for wetter and cooler conditions. There are signs of those type of conditions ahead to start off the season across the Pacific Northwest.

El Niño and La Niña are phases of El Niño Southern Oscillation (ENSO), which measures sea surfaces temperatures across the Central Pacific Ocean. When sea surfaces temperatures are colder than normal by 0.5 degrees Celsius or more, the ENSO phase is considered to be heading into La Niña conditions. If sea surfaces temperatures are warmer by 0.5 degrees Celsius or more, the phase is considered t

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