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United StatesThe weather in September in Lake Oswego
It's warm in September in Lake Oswego with an average temperature of 25°C. Temperatures this month range from a low of 21°C to a high of 29°C. At night, you can expect temperatures between 11°C and 16°C.
Looking for great weather? September is a good time to be in Lake Oswego. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Lake Oswego, Oregon. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2017, Lake Oswego reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 10°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 22°C.
Rainfall amount
In September, there is an average of 83 mm of precipitation, spread over 11 days. The wind speed is around 3 Bft, mostly coming from the West.
Daily weather in September for Lake Oswego
Click on any day in September to get detailed info about the usual weather on that day in Lake Oswego. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Lake Oswego | New York | |
|---|---|---|
| Average temperature | 25°C | 27°C |
| Max. temperature | 29°C | 31°C |
| Min. temperature | 11°C | -5°C |
| Total precipitation | 83 mm | 57 mm |
| Rainy days | 11 days | 9 days |
Start of September
The month of September starts in Lake Oswego with hot temps, averaging around 28°C during the day and nights around 15°C.
Mid September
By mid-September, daytime temps drop to around 24°C, with nights around 14°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Lake Oswego is around 24°C, while nighttime temps are about 13°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of Lake Oswego for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Lake Oswego, Oregon. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Lake Oswego
Temperature in September in Lake Oswego over the years
Precipitation charts
These charts show the average amount of precipitation in September in Lake Oswego, Oregon. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Lake Oswego
Total precipitation in September in Lake Oswego over the years
Daily UV index in September in Lake Oswego
This chart shows the average daily UV index in September in Lake Oswego, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Lake Oswego
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Average weather in Lake Oswego by month
Click on a month below to see detailed weather info for Lake Oswego. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.