November in Lake Oswego is the cloudiest month of the year. In November, the weather in Lake Oswego is typically warm. Average daily high temperature in November is about 11 degrees above zero. On average, Lake Oswego has 18 rainy, 5 cloudy, 5 partly cloudy, and 2 sunny days in November. The rains are usually heavy. November as well as January, February, March, and April is considered the most uncomfortable time to visit Lake Oswego.