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
Port Alsworth's progression into September involves a gentle drop in the average high-temperature, from a cool 55.2°F (12.9°C) in August to a chilly 47.3°F (8.5°C). Port Alsworth observes an average nighttime low-temperature of 36.7°F (2.6°C) during the month of September.Humidity
In September, the average relative humidity is 84%.Rainfall
September is the month with the most rainfall. Rain falls for 20.6 days and accumulates 4.21" (107mm) of precipitation.Snowfall
January through May, August through December are months with snowfall in Port Alsworth. In Port Alsworth, in September, snow falls for 1.2 days, with typically accumulated 0.35" (9mm) of snow. In Port Alsworth, during the entire year, snow falls for 104.8 days and aggregates up to 70.24" (1784mm) of snow.Daylight
The average length of the day in September is 12h and 50min.On the first day of September, sunrise is at 7:14 am and sunset at 9:19 pm. On the last day of the month, sunrise is at 8:22 am and sunset at 7:50 pm AKDT.
Sunshine
In September, the average sunshine is 5.5h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: In September, a regular UV index of 2 translates into these guidelines:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the rainiest month?
How much does it rain in Port Alsworth in September?
How many days does it snow in September?
How many hours of daylight does Port Alsworth have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Port Alsworth, AK
- Average high temperature in September: 47.3°F
The warmest month (with the highest average high temperature) is July (58.3°F).
The month with the lowest average high temperature is January (15.4°F).
- Average low temperature in September: 36.7°F
The month with the highest average low temperature is July (46°F).
The coldest month (with the lowest average low temperature) is January (5.2°F).
Average pressure in September
Port Alsworth, AK
- Average pressure in September: 29.73"Hg
The month with the highest atmospheric pressure is July (29.95"Hg).
The month with the lowest atmospheric pressure is December (29.65"Hg).
Average wind speed in September
Port Alsworth, AK
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is December (6.8mph).
The calmest month (with the lowest average wind speed) is June (5mph).
Average humidity in September
Port Alsworth, AK
- Average humidity in September: 84%
The month with the highest relative humidity is March (90%).
The months with the lowest relative humidity are May and June (74%).
Average rainfall in September
Port Alsworth, AK
- Average rainfall in September: 4.21"
The wettest month (with the highest rainfall) is September (4.21").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in September
Port Alsworth, AK
- Average rainfall days in September: 20.6 days
The month with the highest number of rainy days is August (23.6 days).
The month with the least rainy days is December (8.4 days).
Average snowfall in September
Port Alsworth, AK
- Average snowfall in September: 0.35"
The month with the highest snowfall is December (15.63").
The months with the least snowfall are June and July (0").
Average snowfall days in September
Port Alsworth, AK
- Average snowfall days in September: 1.2 days
The month with the highest number of snowfall days is December (18.5 days).
The months with the least snowfall days are June and July (0 days).
Average daylight in September /
Average sunshine in September
Port Alsworth, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 5h and 3min
The month with the most sunshine is May (Average sunshine: 9h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in September
Port Alsworth, AK
- Average sunshine days in September: 7.6 days
The month with the most sunshine days is January (12.7 days).
The month with the least sunshine days is June (4.8 days).
Average UV index in September
Port Alsworth, AK
- Average UV index in September: 2
The months with the highest UV index are May, June and July (UV index 3).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in September
Port Alsworth, AK
- Average cloud cover in September: 60
The month with the most cloud cover is August (Cloud cover 63).
The month with the least cloud cover is January (Cloud cover 47).
Average visibility in September
Port Alsworth, AK
- Average visibility in September: 5mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are March and April (4mi).
Port Alsworth, Alaska, USA
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