Lake Oswego, OR Weather & Growing Conditions
This Afternoon
60°F
Mostly Cloudy
Mostly cloudy. High near 60, with temperatures falling to around 56 in the afternoon. Northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 60°F | Mostly Cloudy | 2 mph NE | 6% |
| Tonight | 40°F | Partly Cloudy then Areas Of Fog | 1 mph NE | 5% |
| Wednesday | 58°F | Areas Of Fog then Chance Light Rain | 2 mph S | 50% |
| Wednesday Night | 48°F | Light Rain | 2 to 6 mph S | 95% |
| Thursday | 59°F | Slight Chance Light Rain then Partly Sunny | 3 mph SSW | 19% |
| Thursday Night | 46°F | Mostly Cloudy then Chance Light Rain | 1 mph SSW | 49% |
| Friday | 59°F | Chance Light Rain | 2 mph S | 49% |
| Friday Night | 47°F | Slight Chance Light Rain | 1 mph SE | 18% |
| Saturday | 64°F | Partly Sunny then Slight Chance Light Rain | 1 mph S | 15% |
| Saturday Night | 50°F | Light Rain Likely | 1 to 12 mph S | 69% |
| Sunday | 60°F | Light Rain Likely | 1 to 10 mph SSW | 69% |
| Sunday Night | 45°F | Areas Of Fog | 1 mph NE | 18% |
| Monday | 59°F | Areas Of Fog then Chance Light Rain | 2 mph SE | 44% |
| Monday Night | 48°F | Chance Light Rain | 3 mph S | 49% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake Oswego, OR
Last spring frost
Mar 18
First fall frost
Nov 18
Growing season
244 days
Hardiness zone
9a
Explore more for Lake Oswego, OR: full frost dates · planting calendar · Oregon frost dates
Climate data from the nearest NOAA station, Oregon City, Or (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.