September weather forecast and climate
Port Clarence, AK

Weather in September

The first month of the autumn, September, is also a frosty month in Port Clarence, Alaska, with average temperature fluctuating between 44.8°F (7.1°C) and 41°F (5°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a chilly 44.8°F (7.1°C). In September, in Port Clarence, Alaska, the average low-temperature is 41°F (5°C).

Humidity

In September, the average relative humidity in Port Clarence is 81%.

Rainfall

In Port Clarence, during 12.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, in Port Clarence, there are 86.5 rainfall days, and 14.25" (362mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Port Clarence are January through June, September through December. September is the first month it typically snows in Port Clarence. Throughout September, in the average 2.7 snowfall days, it receives 0.28" (7mm) of snow. In Port Clarence, Alaska, during the entire year, snow falls for 90 days, and aggregates up to 20.51" (521mm) of snow.

Daylight

In September, the average length of the day is 13h.

Sunshine

In Port Clarence, the average sunshine is 4.9h.

UV index

In Port Clarence, Alaska, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in September transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. 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.
[Resources]

FAQ

What is the temperature in September in Port Clarence?

The average high-temperature, in September, is 44.8°F (7.1°C), while the average low-temperature is 41°F (5°C).

What is the average humidity in September in Port Clarence?

The average relative humidity in September in Port Clarence, Alaska, is 81%.

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

In September, the rain falls for 12.5 days. Throughout September, 1.38" (35mm) of precipitation is accumulated.

When does it start snowing in Port Clarence?

September is the first month it typically snows in Port Clarence, Alaska. Throughout September, in the average 2.7 snowfall days, it receives 0.28" (7mm) of snow.

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

In September, the average length of the day is 13h.

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

In September, the average sunshine in Port Clarence, Alaska, is 4.9h.

What is the UV index reading in September in Port Clarence?

In September, the average daily maximum UV index in Port Clarence, Alaska, is 2. A UV Index of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.

Average temperature in September
Port Clarence, AK

Average temperature in September - Port Clarence, AK
  • Average high temperature in September: 44.8°F

The warmest month (with the highest average high temperature) is August (50°F).
The month with the lowest average high temperature is January (9°F).

  • Average low temperature in September: 41°F

The month with the highest average low temperature is August (45.3°F).
The coldest months (with the lowest average low temperature) are February and March (1.8°F).

[Resources]

Average pressure in September
Port Clarence, AK

Average pressure in September - Port Clarence, AK
  • Average pressure in September: 29.77"

The month with the highest atmospheric pressure is May (29.96").
The month with the lowest atmospheric pressure is October (29.72").

[Resources]

Average wind speed in September
Port Clarence, AK

Average wind speed in September - Port Clarence, AK
  • Average wind speed in September: 14.9mph

The windiest month (with the highest average wind speed) is December (17.5mph).
The calmest month (with the lowest average wind speed) is May (12mph).

[Resources]

Average humidity in September
Port Clarence, AK

Average humidity in September - Port Clarence, AK
  • Average humidity in September: 81%

The month with the highest relative humidity is March (93%).
Months with the lowest relative humidity are October and November (79%).

[Resources]

Average rainfall in September
Port Clarence, AK

Average rainfall in September - Port Clarence, AK
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is January (0.67").

[Resources]

Average rainfall days in September
Port Clarence, AK

Average rainfall days in September - Port Clarence, AK
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is January (1.3 days).

[Resources]

Average snowfall in September
Port Clarence, AK

Average snowfall in September - Port Clarence, AK
  • Average snowfall in September: 0.28"

The month with the highest snowfall is February (3.62").
Months with the least snowfall are July and August (0").

[Resources]

Average snowfall days in September
Port Clarence, AK

Average snowfall days in September - Port Clarence, AK
  • Average snowfall days in September: 2.7 days

The month with the highest number of snowfall days is April (13 days).
The month with the least snowfall days is July (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Port Clarence, AK

Average daylight in September / Average sunshine in September - Port Clarence, AK
  • Average daylight in September: 13h

The month with the longest days is June (Average daylight: 22h).
The month with the shortest days is December (Average daylight: 3.7h).

  • Average sunshine in September: 4.9h

The month with the most sunshine is August (Average sunshine: 5.7h).
The month with the least sunshine is June (Average sunshine: 0.6h).

[Resources]

Average sunshine days in September
Port Clarence, AK

Average sunshine days in September - Port Clarence, AK
  • Average sunshine days in September: 11.5 days

The month with the most sunshine days is June (18.4 days).
The month with the least sunshine days is October (11.1 days).

[Resources]

Average UV index in September
Port Clarence, AK

Average UV index in September - Port Clarence, AK
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 3).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

[Resources]

Average cloud cover in September
Port Clarence, AK

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

The month with the most cloud cover is February (Cloud cover 78).
The month with the least cloud cover is June (Cloud cover 52).

[Resources]

Average visibility in September
Port Clarence, AK

Average visibility in September - Port Clarence, 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).

[Resources]