September weather forecast and climate
Glennallen, AK

Weather in September

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

Temperature

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

Humidity

In Glennallen, the average relative humidity is 72%.

Rainfall

In Glennallen, during September, the rain falls for 10.1 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, 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 Glennallen. Throughout September, in the average 0.5 snowfall days, it receives 0.2" (5mm) of snow. In Glennallen, during the entire year, snow falls for 54.8 days, and aggregates up to 17.13" (435mm) of snow.

Daylight

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

Sunshine

In September, the average sunshine in Glennallen is 9h.

UV index

Months with the lowest UV index are January through April, September through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 temperature in September in Glennallen?

In Glennallen, in September, the average high-temperature is 51.6°F (10.9°C), and the average low-temperature is 36.5°F (2.5°C).

What is the average humidity in September in Glennallen?

The average relative humidity in September in Glennallen is 72%.

How much does it rain in Glennallen in September?

In Glennallen, Alaska, in September, it is raining for 10.1 days, with typically 0.79" (20mm) of accumulated precipitation.

When does it start snowing in Glennallen?

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

How many hours of daylight does Glennallen have in September?

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

How many hours of sunshine does Glennallen have in September?

In September, the average sunshine in Glennallen is 9h.

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

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

What is the UV index intensity in September in Glennallen?

In Glennallen, Alaska, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to the UV radiation.

Average temperature in September
Glennallen, AK

Average temperature in September - Glennallen, 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
Glennallen, AK

Average pressure in September - Glennallen, 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
Glennallen, AK

Average wind speed in September - Glennallen, 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
Glennallen, AK

Average humidity in September - Glennallen, 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
Glennallen, AK

Average rainfall in September - Glennallen, 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
Glennallen, AK

Average rainfall days in September - Glennallen, 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
Glennallen, AK

Average snowfall in September - Glennallen, 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
Glennallen, AK

Average snowfall days in September - Glennallen, 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
Glennallen, AK

Average daylight in September / Average sunshine in September - Glennallen, 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
Glennallen, AK

Average sunshine days in September - Glennallen, 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
Glennallen, AK

Average UV index in September - Glennallen, 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
Glennallen, AK

Average cloud cover in September - Glennallen, 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
Glennallen, AK

Average visibility in September - Glennallen, 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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