West Linn
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
West Linn, OR

September, the first month of the autumn, in West Linn, is still a warm month, with average temperature fluctuating between 78.1°F (25.6°C) and 52°F (11.1°C).


In West Linn, Oregon, the average high-temperature in September slightly decreases, from 84°F (28.9°C) in August, to a still warm 78.1°F (25.6°C). The average low-temperature, in September, is 52°F (11.1°C).


Throughout September, 1.6" (40.9mm) of precipitation is accumulated. Throughout the year, in West Linn, 44.4" (1126.9mm) of rain is accumulated.


The average length of the day in September in West Linn, Oregon, is 12.5h.

What is the temperature in September in West Linn?

In September, the average high-temperature is 78.1°F (25.6°C), and the average low-temperature is 52°F (11.1°C).

How much does it rain in West Linn in September?

Throughout September, in West Linn, Oregon, 1.6" (40.9mm) of precipitation is accumulated.

How many hours of daylight does West Linn have in September?

The average length of the day in September is 12.5h.
Average temperature in September - West Linn, OR
  • Average high temperature in September: 78°F

The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (47°F).

  • Average low temperature in September: 52°F

Months with the highest average low temperature are July and August (56°F).
The coldest month (with the lowest average low temperature) is December (35°F).

Average rainfall in September - West Linn, OR
  • Average rainfall in September: 1.6"

The wettest month (with the highest rainfall) is December (7.3").
Driest months (with the lowest rainfall) are July and August (0.7").

Average daylight in September - West Linn, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).