September weather forecast
Corvallis, OR

A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University
A large river with two bridges across it in the city of Corvalis, Oregon, home to the famed Oregon State University

Weather in September

September, the first month of the autumn, in Corvallis, is also a moderately hot month, with temperature in the range of an average low of 48.6°F (9.2°C) and an average high of 73.4°F (23°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 80.4°F (26.9°C) in August, to a still moderately hot 73.4°F (23°C). In September, the average low-temperature is 48.6°F (9.2°C).

Humidity

In Corvallis, Oregon, the average relative humidity is 74%.

Rainfall

In Corvallis, during 9.3 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Corvallis, during the entire year, the rain falls for 169.2 days and collects up to 30.28" (769mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in Corvallis is 12.5h.

Sunshine

In September, the average sunshine is 9h.

UV index

In Corvallis, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Corvallis?

The average relative humidity in September in Corvallis is 74%.

How much does it rain in Corvallis in September?

In Corvallis, Oregon, in September, during 9.3 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

When it does not snow in Corvallis?

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

How many hours of daylight does Corvallis have in September?

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

How many hours of sunshine does Corvallis have in September?

In September, the average sunshine in Corvallis, Oregon, is 9h.

What is the UV index intensity in September in Corvallis?

In Corvallis, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Corvallis, OR

Average temperature in September - Corvallis, OR
  • Average high temperature in September: 23°C

The warmest month (with the highest average high temperature) is August (26.9°C).
The month with the lowest average high temperature is December (7.1°C).

  • Average low temperature in September: 9.2°C

The month with the highest average low temperature is August (11.1°C).
The coldest month (with the lowest average low temperature) is December (1.2°C).

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Average pressure in September
Corvallis, OR

Average pressure in September - Corvallis, OR
  • Average pressure in September: 1016.4mbar

The month with the highest atmospheric pressure is January (1019.6mbar).
The month with the lowest atmospheric pressure is August (1016.3mbar).

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Average wind speed in September
Corvallis, OR

Average wind speed in September - Corvallis, OR
  • Average wind speed in September: 6.3km/h

The windiest month (with the highest average wind speed) is March (7.9km/h).
The calmest month (with the lowest average wind speed) is September (6.3km/h).

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Average humidity in September
Corvallis, OR

Average humidity in September - Corvallis, OR
  • Average humidity in September: 74%

The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (69%).

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Average rainfall in September
Corvallis, OR

Average rainfall in September - Corvallis, OR
  • Average rainfall in September: 36mm

The wettest month (with the highest rainfall) is December (122mm).
The driest month (with the least rainfall) is July (7mm).

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Average rainfall days in September
Corvallis, OR

Average rainfall days in September - Corvallis, OR
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (4.5 days).

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Average snowfall in September
Corvallis, OR

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

The month with the highest snowfall is February (45mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in September
Corvallis, OR

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 (1.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Corvallis, OR

Average daylight in September / Average sunshine 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 the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 9h

Months with the most sunshine are July and August (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 3.6h).

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Average sunshine days in September
Corvallis, OR

Average sunshine days in September - Corvallis, OR
  • Average sunshine days in September: 19.3 days

The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in September
Corvallis, OR

Average UV index in September - Corvallis, OR
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Corvallis, OR

Average cloud cover in September - Corvallis, OR
  • Average cloud cover in September: 36

The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in September
Corvallis, OR

Average visibility in September - Corvallis, OR
  • Average visibility in September: 8km

Months with the highest visibility are June, July, August, September and October (8km).
Months with the lowest visibility are January, February, March, April, May, November and December (7km).

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