Lake Oswego, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Oswego, a city in Clackamas County, Oregon.
Overnight
40°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 40. Wind around 0 mph.
7-day forecast for Lake Oswego
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 40°F | Patchy Fog | 0 mph | 1% |
| Wednesday | 58°F | Patchy Fog then Light Rain Likely | 2 mph S | 68% |
| Wednesday Night | 48°F | Light Rain | 2 to 6 mph SSW | 85% |
| Thursday | 59°F | Mostly Sunny | 2 mph SW | 8% |
| Thursday Night | 44°F | Mostly Cloudy | 1 mph NNE | 12% |
| Friday | 59°F | Chance Light Rain | 2 mph S | 26% |
| Friday Night | 47°F | Chance Light Rain then Mostly Cloudy | 1 mph S | 26% |
| Saturday | 63°F | Partly Sunny then Slight Chance Light Rain | 1 mph S | 18% |
| Saturday Night | 49°F | Light Rain | 1 to 12 mph S | 75% |
| Sunday | 58°F | Chance Light Rain | 1 to 9 mph SSW | 46% |
| Sunday Night | 45°F | Slight Chance Light Rain then Mostly Cloudy | 1 mph NE | 15% |
| Monday | 57°F | Chance Light Rain | 1 mph E | 31% |
| Monday Night | 47°F | Chance Light Rain | 3 mph S | 35% |
| Tuesday | 59°F | Chance Light Rain | 3 mph S | 39% |
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
Nearby towns & communities
Barlow
Beavercreek
Boring
Canby
Damascus
Dunthorpe
Estacada
Gladstone
Government Camp
Happy Valley
Jennings Lodge
Johnson City
Milwaukie
Molalla
Mount Hood Villages
Mulino
Oak Grove
Oatfield
Oregon City
Rhododendron
Rivergrove
Sandy
Stafford
West Linn
Wilsonville
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 Nov 4, 2026.