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 registers an average high-temperature of a chilly 44.8°F (7.1°C), slightly varied from August's 50°F (10°C). In September, Port Clarence temperatures settle at a low of 41°F (5°C) during the nights, reflecting a minor change from daytime highs.Humidity
In Port Clarence, the average relative humidity in September is 81%.Rainfall
In September, in Port Clarence, the rain falls for 12.5 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Port Clarence, during the entire year, the rain falls for 86.5 days and collects up to 14.25" (362mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in Port Clarence. 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, during the entire year, snow falls for 90 days and aggregates up to 20.51" (521mm) of snow.Daylight
In Port Clarence, the average length of the day in September is 13h and 1min.On the first day of September, 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.
Sunshine
In Port Clarence, the average sunshine in September is 4.9h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 2 during September translates into the following directions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. When the Sun is at its strongest around midday, find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Port Clarence have in September?
What is the UV index intensity in September?
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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