Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As August transitions to September, the average high-temperature falls from a comfortable 61.9°F (16.6°C) to a fresh 51.6°F (10.9°C). During the nights in September, Glennallen experiences a consistent average temperature of 36.5°F (2.5°C).Humidity
In September, 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. In Glennallen, during the entire year, the rain falls for 81.1 days and collects up to 5.71" (145mm) of precipitation.Snowfall
Months with snowfall in Glennallen are January through May, September through December. September is the first month it typically snows. 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 September, the average length of the day is 12h and 53min.On the first day of the month, sunrise is at 6:34 am and sunset at 8:49 pm. On the last day of September, in Glennallen, sunrise is at 7:49 am and sunset at 7:14 pm AKDT.
Sunshine
The average sunshine in September is 9h.UV index
The months with the lowest UV index are January through April, September through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 2 translates into these guidelines:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. 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. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What is the average September temperature in Glennallen?
What is the average humidity in September in Glennallen?
How many days does it rain in September in Glennallen?
When does it start snowing in Glennallen?
How many hours of daylight does Glennallen have in September?
What time are sunrise and sunset in September in Glennallen?
How long on average sun shines in September in Glennallen?
When is the lowest UV index in Glennallen?
How high is the UV index in September in Glennallen?
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).
Average pressure in September
Glennallen, AK
- Average pressure in September: 29.78"Hg
The month with the highest atmospheric pressure is July (29.95"Hg).
The months with the lowest atmospheric pressure are September, October, November and December (29.78"Hg).
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).
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%).
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").
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).
The months with the least rainy days are February and November (3.7 days).
Average snowfall in September
Glennallen, AK
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (4.57").
The months with the least snowfall are June, July and August (0").
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).
The months with the least snowfall days are June and July (0 days).
Average daylight in September /
Average sunshine in September
Glennallen, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 36min).
The month with the shortest days is December (Average daylight: 5h and 18min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 14h and 12min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).
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).
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).
The months with the lowest UV index are January, February, March, April, September, October, November and December (UV index 2).
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).
Average visibility in September
Glennallen, 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 and March (4mi).
Glennallen, Alaska, USA
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