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
The start of September involves a subtle temperature drop, shifting from a fresh 55°F (12.8°C) in August to a chilly 47.3°F (8.5°C). Port Chilkoot documents a consistent average low-temperature of 38.7°F (3.7°C) at night during September.Humidity
In Port Chilkoot, the average relative humidity in September is 84%.Rainfall
In Port Chilkoot, in September, during 19.5 rainfall days, 4.65" (118mm) of precipitation is typically accumulated. Throughout the year, in Port Chilkoot, there are 200.4 rainfall days, and 48.03" (1220mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Port Chilkoot.Daylight
In September, the average length of the day in Port Chilkoot is 12h and 48min.On the first day of September in Port Chilkoot, sunrise is at 6:01 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:36 pm AKDT.
Sunshine
In September, the average sunshine is 6.4h.UV index
In September, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 during September translates into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the temperature in September in Port Chilkoot?
What is the average humidity in September in Port Chilkoot?
How many days does it rain in September in Port Chilkoot?
When it does not snow in Port Chilkoot?
Does it snow in Port Chilkoot in September?
What is the average length of the day in September in Port Chilkoot?
When are sunrise and sunset in September in Port Chilkoot?
How long on average sun shines in September in Port Chilkoot?
How high is the UV index in September in Port Chilkoot?
Average temperature in September
Port Chilkoot, AK
- Average high temperature in September: 47.3°F
The warmest month (with the highest average high temperature) is July (56.5°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in September: 38.7°F
The month with the highest average low temperature is August (44.1°F).
The coldest month (with the lowest average low temperature) is February (12.4°F).
Average pressure in September
Port Chilkoot, AK
- Average pressure in September: 29.87"Hg
The month with the highest atmospheric pressure is July (30.01"Hg).
The month with the lowest atmospheric pressure is November (29.81"Hg).
Average wind speed in September
Port Chilkoot, AK
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is January (6.7mph).
The calmest month (with the lowest average wind speed) is May (4.7mph).
Average humidity in September
Port Chilkoot, AK
- Average humidity in September: 84%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (78%).
Average rainfall in September
Port Chilkoot, AK
- Average rainfall in September: 4.65"
The wettest month (with the highest rainfall) is November (5.87").
The driest month (with the least rainfall) is June (2.2").
Average rainfall days in September
Port Chilkoot, AK
- Average rainfall days in September: 19.5 days
The month with the highest number of rainy days is October (20.2 days).
The month with the least rainy days is February (9.3 days).
Average snowfall in September
Port Chilkoot, AK
- Average snowfall in September: 0"
The month with the highest snowfall is December (21.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Port Chilkoot, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Port Chilkoot, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 30min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in September
Port Chilkoot, AK
- Average sunshine days in September: 8.2 days
The month with the most sunshine days is February (10.4 days).
The month with the least sunshine days is June (6.3 days).
Average UV index in September
Port Chilkoot, AK
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Port Chilkoot, AK
- Average cloud cover in September: 59
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is May (Cloud cover 47).
Average visibility in September
Port Chilkoot, AK
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Port Chilkoot, Alaska, USA
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