September weather forecast
Koyuk, AK

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Weather in September

The first month of the autumn, September, is still a chilly month in Koyuk, Alaska, with an average temperature ranging between max 48.9°F (9.4°C) and min 40.3°F (4.6°C).

Temperature

The onset of September entails a subtle temperature shift, as the average high-temperature eases from a mild 57.2°F (14°C) in August to a chilly 48.9°F (9.4°C). Koyuk's average temperature during the nights of September is recorded at a cold 40.3°F (4.6°C).

Humidity

In September, the average relative humidity in Koyuk is 80%.

Rainfall

In Koyuk, during September, the rain falls for 15.1 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Koyuk, during the entire year, the rain falls for 118.6 days and collects up to 13.39" (340mm) of precipitation.

Snowfall

Months with snowfall in Koyuk are January through May, September through December. September is the first month it typically snows in Koyuk. Throughout September, in the average 1.4 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 94.3 snowfall days, and 27.2" (691mm) of snow is accumulated.

Daylight

The average length of the day in September in Koyuk is 13h and 0min.
On the first day of September in Koyuk, sunrise is at 7:27 am and sunset at 10:01 pm. On the last day of the month, sunrise is at 8:54 am and sunset at 8:14 pm AKDT.

Sunshine

In September, the average sunshine in Koyuk is 5.3h.

UV index

In Koyuk, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 2 during September leads to these advisories:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. To protect against the Sun's most potent rays, avoid direct exposure around midday. Boost your sun resistance with garments that are densely woven yet spacious. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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Frequently asked questions

What is the usual temperature for Koyuk in September?

In September, the average high-temperature and low-temperature in Koyuk, Alaska, are 48.9°F (9.4°C) and 40.3°F (4.6°C) respectively.

What is the average humidity in September in Koyuk?

In Koyuk, Alaska, the average relative humidity in September is 80%.

How much does it rain in Koyuk in September?

In September, in Koyuk, the rain falls for 15.1 days. Throughout September, 1.42" (36mm) of precipitation is accumulated.

When does it start snowing in Koyuk?

September is the first month it typically snows. Throughout September, in the average 1.4 snowfall days, it receives 0.16" (4mm) of snow.

How many hours of daylight does Koyuk have in September?

In September, the average day length is 13h and 0min.

When is the sunrise / sunset in September in Koyuk?

On the first day of September, sunrise is at 7:27 am and sunset at 10:01 pm. On the last day of the month, sunrise is at 8:54 am and sunset at 8:14 pm AKDT.

How many hours of sunshine does Koyuk have in September?

In September, the average sunshine duration in Koyuk is 5.3h.

What is the UV index intensity in September in Koyuk?

In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Koyuk, AK

Average temperature in September - Koyuk, AK
  • Average high temperature in September: 48.9°F

The warmest month (with the highest average high temperature) is July (59.5°F).
The month with the lowest average high temperature is January (9.1°F).

  • Average low temperature in September: 40.3°F

The month with the highest average low temperature is July (48.7°F).
The coldest month (with the lowest average low temperature) is January (1.8°F).

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Average pressure in September
Koyuk, AK

Average pressure in September - Koyuk, AK
  • Average pressure in September: 29.75"Hg

The month with the highest atmospheric pressure is May (29.92"Hg).
The month with the lowest atmospheric pressure is October (29.72"Hg).

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Average wind speed in September
Koyuk, AK

Average wind speed in September - Koyuk, AK
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is October (9.6mph).
The calmest month (with the lowest average wind speed) is June (6mph).

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Average humidity in September
Koyuk, AK

Average humidity in September - Koyuk, AK
  • Average humidity in September: 80%

The month with the highest relative humidity is March (92%).
The month with the lowest relative humidity is June (72%).

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Average rainfall in September
Koyuk, AK

Average rainfall in September - Koyuk, AK
  • Average rainfall in September: 1.42"

The wettest month (with the highest rainfall) is August (2.24").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in September
Koyuk, AK

Average rainfall days in September - Koyuk, AK
  • Average rainfall days in September: 15.1 days

The month with the highest number of rainy days is August (19.8 days).
The month with the least rainy days is January (2.7 days).

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Average snowfall in September
Koyuk, AK

Average snowfall in September - Koyuk, AK
  • Average snowfall in September: 0.16"

The month with the highest snowfall is November (4.76").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Koyuk, AK

Average snowfall days in September - Koyuk, AK
  • Average snowfall days in September: 1.4 days

The month with the highest number of snowfall days is March (16.7 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in September / Average sunshine in September - Koyuk, AK
  • Average daylight in September: 13h and 0min

The month with the longest days is June (Average daylight: 21h and 36min).
The month with the shortest days is December (Average daylight: 3h and 54min).

  • Average sunshine in September: 5h and 2min

The month with the most sunshine is May (Average sunshine: 8h and 18min).
The month with the least sunshine is June (Average sunshine: 2h and 54min).

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Average sunshine days in September
Koyuk, AK

Average sunshine days in September - Koyuk, AK
  • Average sunshine days in September: 12.5 days

The month with the most sunshine days is January (18.3 days).
The month with the least sunshine days is August (8.4 days).

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Average UV index in September
Koyuk, AK

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

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February, March and December (UV index 1).

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Average cloud cover in September
Koyuk, AK

Average cloud cover in September - Koyuk, AK
  • Average cloud cover in September: 58

The month with the most cloud cover is August (Cloud cover 62).
The month with the least cloud cover is June (Cloud cover 50).

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Average visibility in September
Koyuk, AK

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

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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Koyuk, Alaska, USA

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