September weather forecast and climate
Port Heiden, AK

Weather in September

The first month of the autumn, September, is also a fresh month in Port Heiden, Alaska, with temperature in the range of an average high of 52.3°F (11.3°C) and an average low of 45.3°F (7.4°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a fresh 52.3°F (11.3°C). In Port Heiden, in September, the average low-temperature is 45.3°F (7.4°C).

Humidity

In Port Heiden, the average relative humidity is 84%.

Rainfall

In Port Heiden, during 19.2 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Port Heiden, Alaska, there are 160.7 rainfall days, and 16.57" (421mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. In Port Heiden, Alaska, during the entire year, snow falls for 83.4 days, and aggregates up to 23.94" (608mm) of snow.

Daylight

The average length of the day in September is 12.7h.

Sunshine

In Port Heiden, the average sunshine is 4.6h.

UV index

Months with the highest UV index are May through September, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. 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 Port Heiden?

In September, in Port Heiden, Alaska, the average high-temperature is 52.3°F (11.3°C), and the average low-temperature is 45.3°F (7.4°C).

What is the average humidity in September in Port Heiden?

In September, the average relative humidity in Port Heiden is 84%.

How many days does it rain in September in Port Heiden?

In Port Heiden, in September, during 19.2 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When does it start snowing in Port Heiden?

September is the first month it typically snows in Port Heiden, Alaska. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow.

How many hours of daylight does Port Heiden have in September?

In Port Heiden, the average length of the day in September is 12.7h.

How many hours of sunshine does Port Heiden have in September?

In Port Heiden, Alaska, the average sunshine in September is 4.6h.

What are the months with the highest UV index in Port Heiden?

May through September, with an average maximum UV index of 3, are months with the highest UV index.

What is the UV index intensity in September in Port Heiden?

The average daily maximum UV index in September in Port Heiden, Alaska, is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Port Heiden, AK

Average temperature in September - Port Heiden, AK
  • Average high temperature in September: 52.3°F

The warmest month (with the highest average high temperature) is August (56.8°F).
The month with the lowest average high temperature is January (28.9°F).

  • Average low temperature in September: 45.3°F

The month with the highest average low temperature is August (49.1°F).
The coldest months (with the lowest average low temperature) are January and March (23.4°F).

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Average pressure in September
Port Heiden, AK

Average pressure in September - Port Heiden, AK
  • Average pressure in September: 29.72"

The month with the highest atmospheric pressure is July (29.97").
The month with the lowest atmospheric pressure is December (29.54").

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Average wind speed in September
Port Heiden, AK

Average wind speed in September - Port Heiden, AK
  • Average wind speed in September: 12.6mph

The windiest month (with the highest average wind speed) is December (14.8mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).

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Average humidity in September
Port Heiden, AK

Average humidity in September - Port Heiden, AK
  • Average humidity in September: 84%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (78%).

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Average rainfall in September
Port Heiden, AK

Average rainfall in September - Port Heiden, AK
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is October (2.17").
The driest month (with the least rainfall) is June (0.83").

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Average rainfall days in September
Port Heiden, AK

Average rainfall days in September - Port Heiden, AK
  • Average rainfall days in September: 19.2 days

The month with the highest number of rainy days is September (19.2 days).
The month with the least rainy days is March (7.6 days).

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Average snowfall in September
Port Heiden, AK

Average snowfall in September - Port Heiden, AK
  • Average snowfall in September: 0.12"

The month with the highest snowfall is December (5.71").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Port Heiden, AK

Average snowfall days in September - Port Heiden, AK
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (15.1 days).
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
Port Heiden, AK

Average daylight in September / Average sunshine in September - Port Heiden, AK
  • Average daylight in September: 12.7h

The month with the longest days is June (Average daylight: 17.8h).
The month with the shortest days is December (Average daylight: 6.8h).

  • Average sunshine in September: 4.6h

The month with the most sunshine is May (Average sunshine: 7.7h).
The month with the least sunshine is December (Average sunshine: 2.4h).

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Average sunshine days in September
Port Heiden, AK

Average sunshine days in September - Port Heiden, AK
  • Average sunshine days in September: 7.5 days

The month with the most sunshine days is May (13 days).
The month with the least sunshine days is November (6 days).

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Average UV index in September
Port Heiden, AK

Average UV index in September - Port Heiden, AK
  • Average UV index in September: 3

Months with the highest UV index are May, June, July, August and September (UV index 3).
Months with the lowest UV index are February, March, November and December (UV index 1).

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Average cloud cover in September
Port Heiden, AK

Average cloud cover in September - Port Heiden, AK
  • Average cloud cover in September: 65

The month with the most cloud cover is July (Cloud cover 69).
The month with the least cloud cover is May (Cloud cover 59).

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Average visibility in September
Port Heiden, AK

Average visibility in September - Port Heiden, AK
  • Average visibility in September: 6mi

Months with the highest visibility are April, May, June, July, August, September and October (6mi).
Months with the lowest visibility are January, February, March, November and December (5mi).

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