Honestly, if you've spent more than a week in the Pacific Northwest, you know the "15-day forecast" is basically a polite suggestion from a computer that hasn't actually looked out the window. Right now, Seattle is coming off a brutal stretch. December 2025 left a trail of $40 million in highway damage after a series of atmospheric rivers turned local roads into rivers.
The Short Term: A Rare January Gift
But looking at the 15 day weather Seattle landscape starting today, January 16, things are weirdly... nice?
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We’ve got a massive ridge of high pressure sitting over us like a protective dome. It’s the kind of weather that makes you forget about the "Big Dark." Today is a crisp 51°F with clear, sunny skies. No rain. Zero. The northeast wind is keeping things dry, which is a massive relief for King County crews still trying to repair those 400-plus homes damaged by the floods last week.
If you’re planning your life for the next few days, here’s the vibe:
- Friday & Saturday: Sunny highs of 51°F. It’s perfect "puffy jacket" weather.
- Sunday & Monday: Slightly cooler at 49°F, but the sun is sticking around.
- The Nights: This is where it gets you. Expect lows around 37°F or 38°F. If you haven't wrapped your outdoor pipes yet, do it now.
Why the Forecast Changes (And It Will)
Here is the thing about Seattle in late January. We are currently in a "La Niña" transition. The Climate Prediction Center is seeing a 75% chance that we move into "ENSO-neutral" territory between now and March. For us, that usually means "expect the unexpected."
While the first seven days of this 15-day window look dry, the National Weather Service is already sniffing out a pattern shift. By Thursday, January 22, the clouds start rolling back in. We’re looking at a slow slide back into the gray.
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By the time we hit January 25 and 26, the rain returns. We’re talking a 40% chance of light rain with temperatures hovering in the high 40s. It’s not a "Pineapple Express" level threat yet, but after the saturation we saw in early January, even a little rain makes people nervous.
Snow: The Elephant in the Room
Everyone asks about snow. "Is it going to happen this year?" The Old Farmer’s Almanac and several local models are pointing toward early February as the most likely "snowy period."
For this specific 15-day window? It’s unlikely at sea level. The mountain passes (Snoqualmie and Stevens) are a different story, but for the city, we’re mostly looking at cold rain and overnight frost. The air is just a bit too dry right now for the "Big Snow" everyone either loves or hates.
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What You Should Actually Do
Don't just look at the numbers. Weather in the Puget Sound is about layers and timing.
- Seize the Window: From now until Wednesday, January 21, you have a rare dry stretch. Clean your gutters. The debris from the December storms is probably still sitting there, and you don't want them clogged when the rain returns on the 24th.
- Watch the Fog: With clear skies and light winds, we’re getting "radiation fog." KSEA (Sea-Tac) is already seeing 20-30% probabilities for thick morning fog. If you're flying out, give yourself an extra 45 minutes.
- Check the Lows: 37°F is the magic number. It's not quite a hard freeze for your car's engine, but it's enough to make the bridges and overpasses on I-5 slick as glass by 6:00 AM.
The 15 day weather Seattle forecast shows a city in a brief, beautiful timeout. Enjoy the 51°F sunshine while it lasts, because the "Gray Return" is already scheduled for the following weekend. Basically, get outside now, or wait until April.
Next Steps for You:
- Use the dry weather this weekend to inspect your home's foundation and siding for any new cracks caused by the recent flooding saturation.
- Restock your car’s emergency kit with fresh batteries and a warm blanket before the temperatures dip further in late January.
- Monitor the NWS Seattle "Area Forecast Discussion" for updates on the rain returning around January 24th.