Corvallis
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Corvallis, OR

A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University, a far view of hill ranges
A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University, a far view of hill ranges
The first month of the autumn, September, is still a warm month in Corvallis, Oregon, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 48.2°F (9°C).

Temperature

In Corvallis, the average high-temperature is essentially the same as in August - a still warm 77.2°F (25.1°C). In Corvallis, the average low-temperature is 48.2°F (9°C).

Rainfall

In Corvallis, during September, the rain falls for 7.1 days and regularly aggregates up to 1.5" (37.3mm) of precipitation. Throughout the year, there are 161.2 rainfall days, and 43.7" (1108.9mm) of precipitation is accumulated.

Snowfall

In Corvallis, Oregon, snow does not fall in April through October.

Daylight

In Corvallis, the average length of the day in September is 12.5h.

What is the temperature in September in Corvallis?

The average high-temperature, in September, in Corvallis, is 77.2°F (25.1°C), while the average low-temperature is 48.2°F (9°C).

How much does it rain in Corvallis in September?

In Corvallis, Oregon, in September, it is raining for 7.1 days, with typically 1.5" (37.3mm) of accumulated precipitation.

When it does not snow in Corvallis?

April through October are months without snowfall in Corvallis.

How many hours of daylight does Corvallis have in September?

In September, the average length of the day in Corvallis, Oregon, is 12.5h.
Average temperature in September - Corvallis, OR
  • Average high temperature in September: 77.1°F

The warmest month (with the highest average high temperature) is August (82.4°F).
The month with the lowest average high temperature is December (46.4°F).

  • Average low temperature in September: 48.2°F

The month with the highest average low temperature is July (51.8°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).

Average rainfall in September - Corvallis, OR
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is December (7.4").
The driest month (with the lowest rainfall) is July (0.6").

Average rainfall days in September - Corvallis, OR
  • Average rainfall days in September: 7.1 days

The month with the highest number of rainy days is December (20.8 days).
The month with the lowest number of rainy days is July (3.6 days).

Average snowfall in September - Corvallis, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.2").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Corvallis, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.1 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September - Corvallis, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).