Average annual temperature is 12.4 °C
Absolute maximum temperature: 41.3 °C
Absolute minimum temperature: -6.6 °C
Number of sunny days: 167
Number of rainy days: 197
Number of snow days: 1
Average annual precipitation: 1380 mm
Look at detailed online map of Lake Oswego
* Weather data for Lake Oswego United States is based on climate observations for 2023 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 13.5 | 13.4 | 17.9 | 27.8 | 31.5 | 32.6 | 36.1 | 41.3 | 33.2 | 28.4 | 17 | 16.1 |
| Average daytime temperature (°C) | 9.1 | 8.6 | 10.8 | 14 | 23.4 | 25.9 | 30.9 | 31.7 | 24.4 | 18.6 | 12 | 10.7 |
| Average temperature (°C) | 5.5 | 3.8 | 5.3 | 8.7 | 15.9 | 17.6 | 21.9 | 23.1 | 17.4 | 13 | 8 | 7.6 |
| Average night temperature (°C) | 2.8 | 0.7 | 1.8 | 5 | 10.1 | 11.1 | 14.5 | 16.3 | 12.4 | 9.5 | 5.2 | 5.3 |
| Absolute minimum temperature (°C) | -4.4 | -6.6 | -2.5 | -0.2 | 6.4 | 6.9 | 11.3 | 11.4 | 7.8 | 2 | -2.2 | 0.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.7 | 11.1 | 12.7 | 14.2 | 15.4 | 15.7 | 15.6 | 14.7 | 13.3 | 11.7 | 10.2 | 9 |
| Daylight mean duration (h) | 9.2 | 10.4 | 11.9 | 13.5 | 14.9 | 15.6 | 15.3 | 14.1 | 12.5 | 11 | 9.6 | 8.8 |
| Daylight minimum duration (h) | 8.8 | 9.8 | 11.1 | 12.8 | 14.3 | 15.4 | 14.8 | 13.4 | 11.8 | 10.2 | 9 | 8.7 |
| Sunshine mean duration (h) | 4.1 | 5.5 | 6.4 | 7.4 | 10.8 | 12.7 | 13.6 | 11.6 | 9.4 | 6.6 | 5.4 | 3.9 |
| Precipitation (mm) | 124 | 121 | 171 | 217 | 48 | 35 | 3 | 19 | 71 | 125 | 155 | 291 |
| Sunny days | 7 | 9 | 3 | 5 | 20 | 24 | 26 | 23 | 16 | 14 | 13 | 7 |
| Rainy days | 24 | 18 | 28 | 25 | 11 | 6 | 5 | 8 | 14 | 17 | 17 | 24 |
The best time to visit Lake Oswego during the most sunny months:
Months with the longest average daylight duration in Lake Oswego:
The largest precipitation sum in Lake Oswego is at