Lake Oswego Weather in September

Lake Oswego in September averages 25°C (77°F) during the day and 11°C (52°F) at night. This is part of the summer season. Some rainfall is to be expected.

Rainfall in Lake Oswego in September

Historically, the month has about 9 days of rain, averaging 43 mm (1.7 in) in total. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Lake Oswego in September

September is a good time to be in Lake Oswego. Days are excellent, reaching 25°C (77°F), with nights around 11°C (52°F). September is part of summer. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Lake Oswego in September

The city usually sees around 236 hours of sunlight, indicating many sunny days , a great month for sightseeing.

Wind Speed in Lake Oswego in September

Average wind conditions reach 2 m/s (4 knots) in September. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Lake Oswego.