September weather forecast and climate
Mendeltna, AK

Weather in September

September, the first month of the autumn, in Mendeltna, is also a frosty month, with average temperature ranging between min 32.7°F (0.4°C) and max 43.2°F (6.2°C).

Temperature

In Mendeltna, the average high-temperature in September decreases, from a cool 52.7°F (11.5°C) in August, to a frosty 43.2°F (6.2°C). The average low-temperature, in September, is 32.7°F (0.4°C).

Humidity

In Mendeltna, the average relative humidity in September is 77%.

Rainfall

In Mendeltna, in September, it is raining for 17 days, with typically 1.85" (47mm) of accumulated precipitation. In Mendeltna, during the entire year, the rain falls for 165.3 days and collects up to 17.99" (457mm) of precipitation.

Snowfall

Months with snowfall are January through June, August through December. In Mendeltna, during 6.7 snowfall days, 4.29" (109mm) of snow is typically accumulated. In Mendeltna, during the entire year, snow falls for 161.6 days, and aggregates up to 83.27" (2115mm) of snow.

Daylight

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

Sunshine

In September, the average sunshine is 8.6h.

UV index

Months with the lowest UV index in Mendeltna, Alaska, are January, April, September through December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Mendeltna?

In Mendeltna, in September, the average high-temperature is 43.2°F (6.2°C), and the average low-temperature is 32.7°F (0.4°C).

What is the average humidity in September in Mendeltna?

In Mendeltna, the average relative humidity in September is 77%.

How much does it rain in Mendeltna in September?

In Mendeltna, in September, it is raining for 17 days, with typically 1.85" (47mm) of accumulated precipitation.

How many days does it snow in September in Mendeltna?

In September, it is snowing for 6.7 days. Throughout September, 4.29" (109mm) of snow is accumulated.

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

The average length of the day in September in Mendeltna is 12.9h.

How long on average sun shines in September in Mendeltna?

In Mendeltna, the average sunshine in September is 8.6h.

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

Months with the lowest UV index are January, April, September through December, with an average maximum UV index of 1.

What is the UV index intensity in September in Mendeltna?

In September, the average daily maximum UV index is 1. 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
Mendeltna, AK

Average temperature in September - Mendeltna, AK
  • Average high temperature in September: 43.2°F

The warmest month (with the highest average high temperature) is July (57.7°F).
The month with the lowest average high temperature is January (6.3°F).

  • Average low temperature in September: 32.7°F

The month with the highest average low temperature is July (43.7°F).
The coldest month (with the lowest average low temperature) is January (-5.6°F).

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Average pressure in September
Mendeltna, AK

Average pressure in September - Mendeltna, AK
  • Average pressure in September: 29.77"

The month with the highest atmospheric pressure is July (29.96").
Months with the lowest atmospheric pressure are November and December (29.74").

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Average wind speed in September
Mendeltna, AK

Average wind speed in September - Mendeltna, AK
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is June (5mph).
The calmest month (with the lowest average wind speed) is March (3.9mph).

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Average humidity in September
Mendeltna, AK

Average humidity in September - Mendeltna, AK
  • Average humidity in September: 77%

Months with the highest relative humidity are March and December (90%).
The month with the lowest relative humidity is June (64%).

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Average rainfall in September
Mendeltna, AK

Average rainfall in September - Mendeltna, AK
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is April (0.83").

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Average rainfall days in September
Mendeltna, AK

Average rainfall days in September - Mendeltna, AK
  • Average rainfall days in September: 17 days

The month with the highest number of rainy days is August (20.8 days).
The month with the least rainy days is February (9.1 days).

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Average snowfall in September
Mendeltna, AK

Average snowfall in September - Mendeltna, AK
  • Average snowfall in September: 4.29"

The month with the highest snowfall is December (14.49").
The month with the least snowfall is July (0").

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Average snowfall days in September
Mendeltna, AK

Average snowfall days in September - Mendeltna, AK
  • Average snowfall days in September: 6.7 days

The month with the highest number of snowfall days is December (22.3 days).
The month with the least snowfall days is July (0 days).

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

Average daylight in September / Average sunshine in September - Mendeltna, 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: 8.6h

The month with the most sunshine is June (Average sunshine: 12.6h).
The month with the least sunshine is December (Average sunshine: 3.7h).

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Average sunshine days in September
Mendeltna, AK

Average sunshine days in September - Mendeltna, AK
  • Average sunshine days in September: 7.8 days

The month with the most sunshine days is May (10.7 days).
The month with the least sunshine days is June (6.8 days).

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Average UV index in September
Mendeltna, AK

Average UV index in September - Mendeltna, AK
  • Average UV index in September: 1

The month with the highest UV index is July (UV index 4).
Months with the lowest UV index are January, April, September, October, November and December (UV index 1).

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Average cloud cover in September
Mendeltna, AK

Average cloud cover in September - Mendeltna, AK
  • Average cloud cover in September: 41

The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 37).

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Average visibility in September
Mendeltna, AK

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

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

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