September weather forecast
Port Clarence, AK

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Weather in September

September, the first month of the autumn in Port Clarence, is still a chilly month, with temperature in the range of an average low of 41°F (5°C) and an average high of 44.8°F (7.1°C).

Temperature

With September's arrival, Port Clarence notes an average high-temperature of a chilly 44.8°F (7.1°C), closely following the trend of the preceding month. Port Clarence's temperature during September nights registers a minor decrease to an average low of 41°F (5°C).

Humidity

The average relative humidity in September is 81%.

Rainfall

In Port Clarence, during September, the rain falls for 12.5 days and regularly aggregates up to 1.38" (35mm) of precipitation. In Port Clarence, during the entire year, the rain falls for 86.5 days and collects up to 14.25" (362mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 2.7 snowfall days, it receives 0.28" (7mm) of snow. Throughout the year, there are 90 snowfall days, and 20.51" (521mm) of snow is accumulated.

Daylight

In Port Clarence, the average length of the day in September is 13h and 1min.
On the first day of the month, sunrise is at 7:49 am and sunset at 10:25 pm. On the last day of September, sunrise is at 9:17 am and sunset at 8:36 pm AKDT.

Sunshine

The average sunshine in September is 4.9h.

UV index

In Port Clarence, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.
Note: In September, an average UV index of 2 transforms into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

Port Clarence in September has an average high-temperature of 44.8°F (7.1°C) and an average low-temperature of 41°F (5°C).

What is the average humidity in September?

The average relative humidity in September is 81%.

How much does it rain in September?

In Port Clarence, in September, during 12.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When does it start to snow?

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

What is the average length of the day in September?

In Port Clarence, the average day length in September is 13h and 1min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 7:49 am and sunset at 10:25 pm. On the last day of the month, sunrise is at 9:17 am and sunset at 8:36 pm AKDT.

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

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

How high is the UV index in September?

In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

Average pressure in September
Port Clarence, AK

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

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

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).

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%).
The months with the lowest relative humidity are October and November (79%).

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").

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).

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").
The months with the least snowfall are July and August (0").

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).

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 and 0min

The month with the longest days is June (Average daylight: 22h and 0min).
The month with the shortest days is December (Average daylight: 3h and 42min).

  • Average sunshine in September: 4h and 5min

The month with the most sunshine is August (Average sunshine: 5h and 42min).
The month with the least sunshine is June (Average sunshine: 0h and 36min).

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).

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).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

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).

Average visibility in September
Port Clarence, AK

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

Port Clarence, Alaska, USA

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