Lake Oswego, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Oswego, a city in Clackamas County, Oregon.
This Afternoon
79°F
Mostly Sunny
Mostly sunny, with a high near 79. North wind around 3 mph.
7-day forecast for Lake Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 3 mph N | 0% |
| Tonight | 54°F | Mostly Clear | 2 mph N | 0% |
| Sunday | 82°F | Patchy Fog then Sunny | 3 mph N | 0% |
| Sunday Night | 55°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Monday | 78°F | Partly Sunny | 0 to 5 mph NNW | 0% |
| Monday Night | 54°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Tuesday | 74°F | Partly Sunny | 0 to 3 mph NNW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 0 to 3 mph NNW | 0% |
| Wednesday | 72°F | Mostly Sunny | 2 mph NW | 0% |
| Wednesday Night | 52°F | Mostly Cloudy | 3 mph NNW | 3% |
| Thursday | 70°F | Partly Sunny | 5 mph N | 6% |
| Thursday Night | 52°F | Slight Chance Light Rain | 5 mph NNW | 15% |
| Friday | 67°F | Partly Sunny | 2 to 6 mph NNW | 14% |
| Friday Night | 50°F | Partly Cloudy | 6 mph NW | 9% |
Forecast source: National Weather Service (api.weather.gov) for Lake Oswego (45.414, -122.700). Updated through the day.
Growing snapshot for Lake Oswego
Last spring frost
Mar 18
First fall frost
Nov 18
Growing season
244 days
Hardiness zone
9a
More local growing data for Lake Oswego: nearby ZIP 97034 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Oregon City, Or (5.4 mi from Lake Oswego). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.