Pacific Northwest Winter 2026 Forecast: La Niña to Bring Wetter, Stormier Season to Washington and Oregon
PORTLAND, Oregon — The Pacific Northwest is bracing for a wetter-than-normal winter as a newly confirmed La Niña pattern strengthens across the Pacific Ocean, setting up frequent rain systems, mountain snow, and potential flooding through early 2026.
La Niña Pattern Boosts Storm Track
According to the National Weather Service in Seattle, cooler-than-average ocean temperatures will amplify the Pacific storm corridor from the Oregon coast to the Washington Cascades, steering a steady flow of moisture-laden systems into the region from late November through February.
“This will be a very active pattern,” forecasters said. “Expect numerous storm cycles and only brief breaks between rainfall events.”
While short periods of high-pressure ridging could temporarily dry out the valleys, meteorologists say seasonal rainfall totals are likely to exceed normal levels across western Washington and northwestern Oregon.
Flooding and Travel Concerns
The persistent storms will raise the risk of river flooding, mudslides, and ponding water in urban areas, particularly near the Willamette Valley and Puget Sound.
Residents are advised to clear storm drains, check sump pumps, and secure outdoor items before heavier rainfall begins.
Highway crews are already preparing for frequent mountain pass closures on Interstate 90, U.S. 26, and U.S. 2, as snowpack builds through December and January.
Snowier Season in the Cascades
Ski resorts across the Cascades and Mount Hood region are expected to benefit from consistent powder conditions, with forecasters projecting near-daily snowfall at higher elevations by early January.
This could make the 2025–26 winter one of the best seasons for skiing and snowboarding in recent years, thanks to a cool, moist air pattern favoring long-lasting snow cover.
“We’re looking at a strong setup for snow accumulation,” meteorologists added. “Ski areas should see healthy base layers building early this winter.”
Coastal Impacts and Windy Systems
Along the Oregon and Washington coasts, a series of strong fronts may trigger high surf advisories and coastal erosion, especially during high tide cycles. Mariners should expect rough seas and gale warnings during the height of the pattern in December and January.
Outlook Summary: Wet, Windy, and Classic La Niña
Overall, the region is expected to see above-average precipitation, cooler-than-normal temperatures, and frequent wind events through February. Residents are urged to plan for occasional flooding, travel disruptions, and power outages, particularly in rural and coastal zones.
For ongoing Washington and Oregon weather updates, La Niña coverage, and Pacific Northwest storm forecasts, visit NapervilleLocal.com.
I’ve lived in Naperville long enough to see how quickly our community changes — from new developments downtown to sudden shifts in our Midwest weather. Reporting on Naperville news and daily forecasts gives me the chance to keep neighbors informed about what really matters. My goal is simple: deliver clear, timely updates so you always know what’s happening in our city and what to expect from the skies above.