September weather forecast
Cottage Grove, OR

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The white Contennial Coverd Bridge with the scenic Cottage Grove in Oregon
The white Contennial Coverd Bridge with the scenic Cottage Grove in Oregon

Weather in September

The first month of the autumn, September, is still a warm month in Cottage Grove, Oregon, with an average temperature varying between 73.6°F (23.1°C) and 46°F (7.8°C).

Temperature

In Cottage Grove, the average high-temperature in September gently drops from 80.1°F (26.7°C) in August to a still warm 73.6°F (23.1°C). A marked drop from daytime peak temperatures to an average low-temperature of 46°F (7.8°C) is observed during the nights in September.

Humidity

In September, the average relative humidity in Cottage Grove is 74%.

Rainfall

In September, the rain falls for 8.1 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. Throughout the year, there are 157.8 rainfall days, and 30.63" (778mm) of precipitation is accumulated.

Snowfall

In Cottage Grove, snow does not fall in May through October.

Daylight

The average length of the day in September is 12h and 29min.
On the first day of September, sunrise is at 6:36 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:54 pm PDT.

Sunshine

In September, the average sunshine is 9.3h.

UV index

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A daily high UV index of 3 in September leads to these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
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Frequently asked questions

What is the average September temperature in Cottage Grove?

During September, Cottage Grove experiences an average high-temperature of 73.6°F (23.1°C) and a low-temperature of 46°F (7.8°C).

What is the average humidity in September in Cottage Grove?

In Cottage Grove, Oregon, the average relative humidity in September is 74%.

How much does it rain in Cottage Grove in September?

In Cottage Grove, Oregon, in September, during 8.1 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When it does not snow in Cottage Grove?

In Cottage Grove, snow does not fall in May through October.

How many hours of daylight does Cottage Grove have in September?

In Cottage Grove, Oregon, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Cottage Grove?

On the first day of September, sunrise is at 6:36 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:54 pm PDT.

How long on average sun shines in September in Cottage Grove?

The average sunshine duration in September is 9.3h.

What is the UV index reading in September in Cottage Grove?

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cottage Grove, OR

Average temperature in September - Cottage Grove, OR
  • Average high temperature in September: 73.6°F

The warmest month (with the highest average high temperature) is August (80.1°F).
The month with the lowest average high temperature is December (45.9°F).

  • Average low temperature in September: 46°F

The month with the highest average low temperature is August (48.7°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).

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Average pressure in September
Cottage Grove, OR

Average pressure in September - Cottage Grove, OR
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in September
Cottage Grove, OR

Average wind speed in September - Cottage Grove, OR
  • Average wind speed in September: 3.5mph

The windiest month (with the highest average wind speed) is January (4.5mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

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Average humidity in September
Cottage Grove, OR

Average humidity in September - Cottage Grove, OR
  • Average humidity in September: 74%

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are July and August (70%).

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Average rainfall in September
Cottage Grove, OR

Average rainfall in September - Cottage Grove, OR
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is December (4.61").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days in September
Cottage Grove, OR

Average rainfall days in September - Cottage Grove, OR
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is March (20.1 days).
The month with the least rainy days is August (3.6 days).

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Average snowfall in September
Cottage Grove, OR

Average snowfall in September - Cottage Grove, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Cottage Grove, OR

Average snowfall days in September - Cottage Grove, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.8 days).
The 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
Cottage Grove, OR

Average daylight in September / Average sunshine in September - Cottage Grove, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The months with the least sunshine are February and December (Average sunshine: 4h and 12min).

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Average sunshine days in September
Cottage Grove, OR

Average sunshine days in September - Cottage Grove, OR
  • Average sunshine days in September: 20 days

The month with the most sunshine days is July (25.8 days).
The months with the least sunshine days are February and March (9.3 days).

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Average UV index in September
Cottage Grove, OR

Average UV index in September - Cottage Grove, OR
  • Average UV index in September: 3

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

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Average cloud cover in September
Cottage Grove, OR

Average cloud cover in September - Cottage Grove, OR
  • Average cloud cover in September: 33

The month with the most cloud cover is March (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in September
Cottage Grove, OR

Average visibility in September - Cottage Grove, OR
  • Average visibility in September: 5mi

The months with the highest visibility are July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (4mi).

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Cottage Grove, Oregon, USA

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