September weather forecast and climate
Copperville, AK

Weather in September

September, the first month of the autumn, in Copperville, is also a fresh month, with average temperature varying between 51.6°F (10.9°C) and 36.5°F (2.5°C).

Temperature

In September, the average high-temperature drops, from a comfortable 61.9°F (16.6°C) in August, to a fresh 51.6°F (10.9°C). In Copperville, the average low-temperature is 36.5°F (2.5°C).

Humidity

In Copperville, the average relative humidity is 72%.

Rainfall

In September, in Copperville, Alaska, the rain falls for 10.1 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. Throughout the year, in Copperville, there are 81.1 rainfall days, and 5.71" (145mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows in Copperville. Throughout September, in the average 0.5 snowfall days, it receives 0.2" (5mm) of snow. In Copperville, Alaska, during the entire year, snow falls for 54.8 days, and aggregates up to 17.13" (435mm) of snow.

Daylight

In Copperville, the average length of the day is 12.9h.

Sunshine

In Copperville, Alaska, the average sunshine in September is 9h.

UV index

January through April, September through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 in September transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Copperville?

In Copperville, Alaska, the average relative humidity in September is 72%.

How much does it rain in Copperville in September?

In September, in Copperville, the rain falls for 10.1 days. Throughout September, 0.79" (20mm) of precipitation is accumulated.

When does it start to snow in Copperville?

September is the first month it typically snows in Copperville. Throughout September, in the average 0.5 snowfall days, it receives 0.2" (5mm) of snow.

What is the average length of the day in September in Copperville?

In September, the average length of the day is 12.9h.

How many hours of sunshine does Copperville have in September?

In Copperville, Alaska, the average sunshine in September is 9h.

What are the months with the lowest UV index in Copperville?

Months with the lowest UV index are January through April, September through December, with an average maximum UV index of 2.

What is the UV index intensity in September in Copperville?

In September, the average daily maximum UV index in Copperville, Alaska, is 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.

Average temperature in September
Copperville, AK

Average temperature in September - Copperville, AK
  • Average high temperature in September: 51.6°F

The warmest month (with the highest average high temperature) is July (67.5°F).
The month with the lowest average high temperature is January (9.1°F).

  • Average low temperature in September: 36.5°F

The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is January (-1.8°F).

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Average pressure in September
Copperville, AK

Average pressure in September - Copperville, AK
  • Average pressure in September: 29.78"

The month with the highest atmospheric pressure is July (29.95").
Months with the lowest atmospheric pressure are September, October, November and December (29.78").

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Average wind speed in September
Copperville, AK

Average wind speed in September - Copperville, AK
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest months (with the lowest average wind speed) are January and December (4.5mph).

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Average humidity in September
Copperville, AK

Average humidity in September - Copperville, AK
  • Average humidity in September: 72%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is June (57%).

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Average rainfall in September
Copperville, AK

Average rainfall in September - Copperville, AK
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is August (0.91").
The driest month (with the least rainfall) is April (0.2").

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Average rainfall days in September
Copperville, AK

Average rainfall days in September - Copperville, AK
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is August (11.3 days).
Months with the least rainy days are February and November (3.7 days).

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Average snowfall in September
Copperville, AK

Average snowfall in September - Copperville, AK
  • Average snowfall in September: 0.2"

The month with the highest snowfall is December (4.57").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Copperville, AK

Average snowfall days in September - Copperville, AK
  • Average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is December (11.2 days).
Months with the least snowfall days are June and July (0 days).

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Average daylight in September /
Average sunshine in September
Copperville, AK

Average daylight in September / Average sunshine in September - Copperville, AK
  • Average daylight in September: 12.9h

The month with the longest days is June (Average daylight: 19.6h).
The month with the shortest days is December (Average daylight: 5.3h).

  • Average sunshine in September: 9h

The month with the most sunshine is June (Average sunshine: 14.2h).
Months with the least sunshine are January and December (Average sunshine: 3.9).

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Average sunshine days in September
Copperville, AK

Average sunshine days in September - Copperville, AK
  • Average sunshine days in September: 17.6 days

The month with the most sunshine days is March (24.2 days).
The month with the least sunshine days is August (17.3 days).

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Average UV index in September
Copperville, AK

Average UV index in September - Copperville, AK
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, April, September, October, November and December (UV index 2).

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Average cloud cover in September
Copperville, AK

Average cloud cover in September - Copperville, AK
  • Average cloud cover in September: 39

The month with the most cloud cover is December (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 33).

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Average visibility in September
Copperville, AK

Average visibility in September - Copperville, AK
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September and October (6mi).
Months with the lowest visibility are January and March (4mi).

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