September weather forecast and climate
Big Delta, AK

Weather in September

The first month of the autumn, September, is also a fresh month in Big Delta, Alaska, with average temperature varying between 53.6°F (12°C) and 37.9°F (3.3°C).

Temperature

In September, the average high-temperature decreases, from an enjoyable 64.4°F (18°C) in August, to a cool 53.6°F (12°C). In Big Delta, Alaska, the average low-temperature is 37.9°F (3.3°C).

Humidity

The average relative humidity is 67%.

Rainfall

In Big Delta, it is raining for 8.4 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, in Big Delta, Alaska, there are 70.4 rainfall days, and 7.56" (192mm) of precipitation is accumulated.

Snowfall

January through May, August through December are months with snowfall. In Big Delta, Alaska, during September, snow falls for 1.9 days and regularly aggregates up to 0.71" (18mm) of snow. Throughout the year, there are 56.2 snowfall days, and 18.66" (474mm) of snow is accumulated.

Daylight

In Big Delta, the average length of the day is 12.9h.

Sunshine

In Big Delta, the average sunshine is 8.4h.

UV index

Months with the lowest UV index are January through March, September through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Big Delta?

The average high-temperature, in September, is 53.6°F (12°C), while the average low-temperature is 37.9°F (3.3°C).

What is the average humidity in September in Big Delta?

The average relative humidity in September in Big Delta is 67%.

How many days does it rain in September in Big Delta?

In Big Delta, during September, the rain falls for 8.4 days and regularly aggregates up to 0.59" (15mm) of precipitation.

How much does it snow in Big Delta in September?

In Big Delta, in September, snow falls for 1.9 days, with typically accumulated 0.71" (18mm) of snow.

How many hours of daylight does Big Delta have in September?

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

How many hours of sunshine does Big Delta have in September?

The average sunshine in September is 8.4h.

What are the months with the lowest UV index in Big Delta?

Months with the lowest UV index in Big Delta, Alaska, are January through March, September through December, with an average maximum UV index of 2.

How high is the UV index in September in Big Delta?

In September, the average daily maximum UV index in Big Delta is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Big Delta, AK

Average temperature in September - Big Delta, AK
  • Average high temperature in September: 53.6°F

The warmest month (with the highest average high temperature) is July (69.8°F).
The month with the lowest average high temperature is January (5.4°F).

  • Average low temperature in September: 37.9°F

The month with the highest average low temperature is July (50.5°F).
The coldest month (with the lowest average low temperature) is January (-5.8°F).

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Average pressure in September
Big Delta, AK

Average pressure in September - Big Delta, AK
  • Average pressure in September: 29.77"

The month with the highest atmospheric pressure is February (29.97").
The month with the lowest atmospheric pressure is September (29.77").

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Average wind speed in September
Big Delta, AK

Average wind speed in September - Big Delta, AK
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in September
Big Delta, AK

Average humidity in September - Big Delta, AK
  • Average humidity in September: 67%

The month with the highest relative humidity is March (88%).
The month with the lowest relative humidity is May (51%).

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Average rainfall in September
Big Delta, AK

Average rainfall in September - Big Delta, AK
  • Average rainfall in September: 0.59"

The wettest month (with the highest rainfall) is August (1.57").
The driest month (with the least rainfall) is February (0.24").

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Average rainfall days in September
Big Delta, AK

Average rainfall days in September - Big Delta, AK
  • Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is August (12.3 days).
The month with the least rainy days is November (1.7 days).

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Average snowfall in September
Big Delta, AK

Average snowfall in September - Big Delta, AK
  • Average snowfall in September: 0.71"

Months with the highest snowfall are March and October (2.99").
Months with the least snowfall are June and July (0").

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Average snowfall days in September
Big Delta, AK

Average snowfall days in September - Big Delta, AK
  • Average snowfall days in September: 1.9 days

The month with the highest number of snowfall days is November (9.6 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
Big Delta, AK

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

The month with the longest days is June (Average daylight: 20.9h).
The month with the shortest days is December (Average daylight: 4.4h).

  • Average sunshine in September: 8.4h

The month with the most sunshine is June (Average sunshine: 13.4h).
The month with the least sunshine is December (Average sunshine: 2.3h).

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Average sunshine days in September
Big Delta, AK

Average sunshine days in September - Big Delta, AK
  • Average sunshine days in September: 18.6 days

Months with the most sunshine days are January and December (23.5 days).
The month with the least sunshine days is August (17.4 days).

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Average UV index in September
Big Delta, AK

Average UV index in September - Big Delta, AK
  • Average UV index in September: 2

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

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Average cloud cover in September
Big Delta, AK

Average cloud cover in September - Big Delta, AK
  • Average cloud cover in September: 40

Months with the most cloud cover are March and November (Cloud cover 45).
The month with the least cloud cover is May (Cloud cover 35).

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Average visibility in September
Big Delta, AK

Average visibility in September - Big Delta, 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, February, March, April, November and December (5mi).

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