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 also a moderately hot month in Cottage Grove, Oregon, with an average temperature varying between 73.6°F (23.1°C) and 46°F (7.8°C).

Temperature

September brings a slight decrease in the average high-temperature, shifting from 80.1°F (26.7°C) in August to a still moderately hot 73.6°F (23.1°C). Cottage Grove experiences a dramatic descent in temperature during September, with the average nighttime reading settling at a frosty 46°F (7.8°C).

Humidity

The average relative humidity in September in Cottage Grove is 74%.

Rainfall

In Cottage Grove, in September, during 8.1 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Cottage Grove, during the entire year, the rain falls for 157.8 days and collects up to 30.63" (778mm) of precipitation.

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 Cottage Grove, the average sunshine in September is 9.3h.

UV index

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a daily UV index of 3 turns into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.

Frequently asked questions

What is the usual temperature for Cottage Grove in September?

In Cottage Grove, 73.6°F (23.1°C) is the average high-temperature and 46°F (7.8°C) is the average low-temperature during September.

What is the average humidity in September?

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

How many days does it rain in September?

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

When it does not snow?

May through October are months without snowfall.

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

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

What time are sunrise and sunset in September?

In September, on the first day of the month, 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 many hours of sunshine does Cottage Grove have in September?

The average sunshine duration in September is 9.3h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Cottage Grove, Oregon, USA

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