Seattle Winter 2025 Forecast. With noaa officially declaring that la niña—the climate pattern that results in cooler ocean temperatures in the equatorial pacific—will return for an encore this winter,. During the month of february,.

November 2024 to october 2025 winter will be colder than normal in the north and warmer in the south, with the coldest periods in early and late january and early march. A la niña winter in seattle means the odds of seeing at least some lowland snow is increased.