Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's weather records an average high-temperature of a chilly 44.8°F (7.1°C), showing little deviation from August. Port Clarence experiences a steady nighttime temperature of 41°F (5°C) throughout the month of September.Humidity
In September, the average relative humidity 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. Throughout the year, there are 86.5 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. 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
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 in Port Clarence is 4.9h.UV index
In Port Clarence, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 2 in September leads to these recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Frequently asked questions
What is the usual temperature for Port Clarence in September?
What is the average humidity in September in Port Clarence?
How much does it rain in Port Clarence in September?
When does it start to snow in Port Clarence?
What is the average length of the day in September in Port Clarence?
When is the sunrise / sunset in September in Port Clarence?
How long on average sun shines in September in Port Clarence?
How high is the UV index in September in Port Clarence?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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