Honestly, looking at the sky over the lake right now, you’d never guess how chaotic the last two weeks have been. We just survived a brutal stretch where the Pacific Northwest got slammed by high winds and freezing temperatures. In fact, between the falling trees and the bitter chill, things got pretty scary for a minute there. But as of Sunday, January 18, 2026, the vibe in Lake Oswego has completely shifted.
The sun is out. The air is crisp.
If you’re checking the 10 day forecast lake oswego, you’re probably looking for a reason to finally wash the road salt off your car or perhaps go for a walk at George Rogers Park without needing four layers of wool.
The Immediate Outlook: Sun and a Substantial Chill
Right now, we are sitting at 46°F. It’s sunny, which feels like a minor miracle after the grey January we’ve had. But don't let the "feels like" temp of 42°F fool you; the northeast wind is cutting at 8 mph, so it’s still definitely coat weather.
🔗 Read more: Finding the Right Word That Starts With AJ for Games and Everyday Writing
Today, Sunday, we’re looking at a high of 48°F. Tonight is going to be clear and cold, dropping down to 33°F. It’s that classic Oregon "fake spring" moment where the sun is blinding but the ground is still frozen solid.
Monday, January 19, actually looks even better for outdoor chores. We’re hitting 50°F with nothing but sun. However, keep an eye on Monday night. The temperature is expected to crater to 30°F. If you haven’t drained your backflow assembly or covered those sensitive shrubs yet, Monday night is your final warning before the overnight freezes become a daily occurrence this week.
Mid-Week Transition: When the Clouds Creep Back
By Tuesday, the "mostly sunny" honeymoon starts to fade. We’re looking at a high of 47°F and a low of 30°F. The humidity is going to jump up to about 75%, making that 30°F feel a lot more damp and "bone-chilling" than the dry cold we have right now.
💡 You might also like: Is there actually a legal age to stay home alone? What parents need to know
Lake Oswego Daily Forecast Breakdown
- Wednesday, Jan 21: Cloudy. High of 45°F, low of 29°F.
- Thursday, Jan 22: Mostly cloudy. High of 44°F, low of 28°F.
- Friday, Jan 23: Partly sunny but becoming unsettled. High of 42°F, low of 28°F.
It’s worth noting that Thursday and Friday are the coldest days in this ten-day stretch. Those 28°F lows are no joke for local pipes. Interestingly, the wind stays pretty calm mid-week, bottoming out at just 2 mph from the north on Thursday. It’ll be a stagnant, cold block of air sitting over the valley.
The Return of the Rain: Late January Trends
Kinda seems like Lake Oswego can't stay dry for more than a week, right? By Friday night, the chance of precipitation starts ticking up to 25%. We’re looking at light rain moving in.
Saturday, January 24, brings a high of 43°F and a low of 36°F with a 25% chance of showers. It’s not a washout, but it’s that annoying Oregon mist that makes everything slippery. Sunday, January 25, is much of the same: light rain, 46°F for the high, and 40°F for the low.
📖 Related: The Long Haired Russian Cat Explained: Why the Siberian is Basically a Living Legend
The "warm-up" (if you can call it that) actually happens toward the end of the forecast. On Monday, January 26, we might actually hit 53°F. That’s the warmest day on the horizon, though it’ll be mostly cloudy.
Why the 10 Day Forecast Lake Oswego Matters Right Now
We’re in a weird spot. Earlier this month, around January 8-9, we saw record-breaking rainfall and flash flooding across the country, and the PNW had its own share of drama with snowpack struggles and ice. According to recent reports from the USDA Natural Resources Conservation Service, the Willamette Basin snowpack was only at 39% of the median as of January 11.
While the valley floor is staying mostly dry this week, the lack of heavy precipitation isn't great news for our summer water levels. But for the average person living near the West Bay or over in Mountain Park, this forecast is basically a "green light" to get outside before the next rainy system locks in.
Staying Prepared: Actionable Steps
Since we’re looking at multiple nights of sub-freezing temperatures (28°F to 30°F), here is what you actually need to do:
- Drip the Faucets: When we hit that 28°F low on Thursday night, it’s worth letting a slow drip run on any faucets located on exterior walls.
- Pet Safety: With lows consistently below freezing for the next six nights, keep the dogs inside. Even the furry ones can get frostbite on their paws during those 28°F stretches.
- Check the Gutters: We have a few days of dry weather. Use them. Clear out the needles and leaves now so that when the rain returns on Saturday (Jan 24), your downspouts aren't overflowing onto your foundation.
- Humidity Control: Indoor humidity is going to spike as we move from 59% today to 89% by next Saturday. If your windows are sweating, crank the dehumidifier to prevent mold growth in those chilly corners of the house.
Essentially, enjoy the sun on Monday. It’s going to be the literal high point of the week before we settle back into the standard, chilly Oregon winter routine.