Snow in Seattle is highly variable year to year, but you can expect the first chances of measurable snowfall on or near typical winter dates, with stronger chances for accumulation generally in late December through February. For a precise forecast, check updated local weather advisories as early as late fall and watch for La Niña or other Pacific Ocean patterns that can shift snowfall chances. Key points to track
- First potential snowfall: Historically, Seattle’s first measurable snow tends to occur by late December, with variability year to year.
- La Niña influence: Weak to moderate La Niña conditions can bring cooler, wetter patterns later in winter, which can increase mountain snow and sometimes lead to lowland precipitation events. The exact impact varies by season.
- Mountain passes: When snow is expected, mountain passes around the Seattle area (e.g., Snoqualmie, Stevens) are more likely to see snowfall and travel impacts before or after Seattle’s city temperatures drop. Be prepared for rapid weather changes if traveling over the passes.
What to do now
- Check a reliable local forecast daily from a trusted source (National Weather Service Seattle office or a major local news outlet) as winter approaches. They will provide the most current expectations for snow chances and any advisories.
- If you need to plan travel or outdoor activities, monitor mountain passes and winter weather advisories, since higher elevations can see significant snowfall even when city snowfall is minimal.
If you’d like, I can monitor recent forecasts and summarize the latest Seattle snowfall outlook for the coming weeks, or pull the most up-to-date forecast from reliable sources.
