Lake Oswego, OR Weather & Growing Conditions
Tonight
40°F
Partly Cloudy then Areas Of Fog
Areas of fog after midnight. Partly cloudy, with a low around 40. Wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Partly Cloudy then Areas Of Fog | 0 mph | 5% |
| Wednesday | 57°F | Areas Of Fog then Chance Light Rain | 2 mph S | 51% |
| 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 | 17% |
| Thursday Night | 46°F | Mostly Cloudy then Chance Light Rain | 1 mph WNW | 50% |
| Friday | 58°F | Chance Light Rain | 2 mph SSE | 50% |
| Friday Night | 47°F | Slight Chance Light Rain then Mostly Cloudy | 1 mph E | 18% |
| Saturday | 63°F | Partly Sunny then Slight Chance Light Rain | 1 mph S | 15% |
| Saturday Night | 50°F | Light Rain Likely | 1 to 10 mph S | 68% |
| Sunday | 59°F | Light Rain Likely | 1 to 8 mph SSW | 68% |
| Sunday Night | 45°F | Areas Of Fog | 1 mph W | 18% |
| Monday | 59°F | Areas Of Fog then Chance Light Rain | 2 mph SE | 44% |
| Monday Night | 48°F | Chance Light Rain | 2 mph S | 49% |
| Tuesday | 61°F | Chance Light Rain | 2 mph S | 52% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake Oswego, OR
Last spring frost
Apr 1
First fall frost
Nov 6
Growing season
222 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, Beaverton 2 Ssw, Or (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.