If you’ve lived in the Willamette Valley long enough, you know the drill. You wake up, look out the window, and basically see a wall of gray cotton candy. It’s that classic Eugene soup. Looking at the 30 day forecast Eugene Oregon, we’re staring down the barrel of a January and February that feels pretty standard, though with a few La Niña-flavored curveballs thrown in for good news.
The current vibe? Chilly. Right now, on this Sunday, January 18, 2026, it’s a crisp 26°F outside. Humidity is maxed out at 100%. If you step outside, you aren't just feeling the cold; you're wearing it.
What the Next Month Actually Looks Like
Honestly, the biggest mistake people make with a 30-day outlook is expecting a daily play-by-play. Weather models are good, but they aren't psychics. What we can see is a trend toward a "warmer than normal" winter, which in Eugene terms means we might spend more time in the mid-40s rather than the low-30s.
For the immediate week ahead:
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- Monday and Tuesday (Jan 19-20): Expect highs of 43°F to 44°F with overnight lows dipping back to 25°F. It’s mostly cloudy, but you might see a peek of "partly sunny" sky on Monday.
- Mid-week Shift: By Thursday, January 22, the "dry-ish" spell breaks. We’re looking at light rain and a high of 47°F.
- The Weekend: Saturday, January 24, brings a 35% chance of rain during the day and a high of 45°F.
As we move deeper into the 30 day forecast Eugene Oregon, the Farmer’s Almanac and NOAA’s Climate Prediction Center are both leaning into this weak La Niña pattern. Traditionally, La Niña means "cool and wet" for the Pacific Northwest. However, for 2026, the transition to ENSO-neutral conditions is already starting.
The Snow Question
Everyone wants to know about the white stuff.
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Usually, Eugene gets its biggest snow threat in early February. According to the current long-range data, Feb 1–4 looks particularly cold. There’s a potential for rain and snow to mix, especially for those of you living up in the South Hills or out toward Spencer Butte.
The valley floor? It’s a gamble. We’re currently seeing a 10% chance of snow flurries today and tomorrow, but with temperatures hitting 43°F during the day, nothing is sticking. To get real accumulation, we need that Arctic air to slide down the Columbia River Gorge and hook a left. Right now, the models show the coldest air staying north or east of the Cascades.
Rainfall and Reservoir Reality
We’re actually trailing a bit on precipitation. January is trending about 2 inches below the usual average. While that makes for nicer afternoon walks at Alton Baker Park, Larry O’Neill (Oregon’s State Climatologist) has noted in recent briefings that we still need that late-winter moisture to fully kick the "stubborn drought" conditions that plagued 2025.
Expect February to be the "makeup" month. The forecast suggests 5.5 inches of rain for February, which is an inch above the historical average.
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Survival Tips for the Gray Stretch
You’ve gotta lean into it.
- Vitamin D is non-negotiable. Seriously. When the clouds don't break for 10 days, your brain starts to feel like a damp sponge.
- The "Eugene Uniform" is real for a reason. Get a shell that is actually waterproof, not "water-resistant." There’s a difference, and you’ll learn it the hard way at a Saturday Market.
- Watch the black ice. With lows hitting 25°F this week and 100% humidity, the bridges over the Willamette (like the Ferry Street Bridge) get sketchy fast.
The 30 day forecast Eugene Oregon shows a slow climb. By the end of January, we’ll likely see more consistent 50-degree days. It’s that weird transition where you’re wearing a heavy parka in the morning and carrying it by 2:00 PM.
Actionable Next Steps:
- Check your gutters now. Before the heavier February rains hit (expected to start around Feb 5), make sure the January leaves aren't clogging your drainage.
- Swap your tires? If you’re heading over the passes (Willamette or Santiam), the 30-day outlook shows significant mountain snow. Don't chance it with summer tires.
- Plan your garden. It’s too early to plant, but the "sunny periods" mentioned for late January (Jan 23-31) are perfect for clearing beds before the February soak begins.