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 onset of September results in a decrease in the average high-temperature, receding from a refreshing 60.4°F (15.8°C) in August to a chilly 48.7°F (9.3°C). Koyukuk records a steady low-temperature average of 35.6°F (2°C) during September.Humidity
In Koyukuk, Alaska, the average relative humidity in September is 82%.Rainfall
In Koyukuk, Alaska, in September, it is raining for 15 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, in Koyukuk, there are 116.7 rainfall days, and 14.8" (376mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Koyukuk. September is the first month it typically snows. Throughout September, in the average 2.3 snowfall days, it receives 0.55" (14mm) of snow. In Koyukuk, during the entire year, snow falls for 115.2 days and aggregates up to 43.07" (1094mm) of snow.Daylight
In Koyukuk, Alaska, the average length of the day in September is 13h and 0min.On the first day of September in Koyukuk, sunrise is at 7:13 am and sunset at 9:47 pm. On the last day of the month, sunrise is at 8:40 am and sunset at 8:00 pm AKDT.
Sunshine
The average sunshine in September is 5.2h.UV index
The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 2 translates into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. It's recommended to limit sun exposure when its radiation is at its peak during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What are September temperatures in Koyukuk?
What is the average humidity in September in Koyukuk?
How much does it rain in Koyukuk in September?
When does it start to snow in Koyukuk?
How many hours of daylight does Koyukuk have in September?
When is the sunrise / sunset in September in Koyukuk?
How long on average sun shines in September in Koyukuk?
What is the UV index reading in September in Koyukuk?
Average temperature in September
Koyukuk, AK
- Average high temperature in September: 48.7°F
The warmest month (with the highest average high temperature) is July (67.3°F).
The month with the lowest average high temperature is January (-0.8°F).
- Average low temperature in September: 35.6°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is January (-10.5°F).
Average pressure in September
Koyukuk, AK
- Average pressure in September: 29.76"Hg
The month with the highest atmospheric pressure is February (29.93"Hg).
The months with the lowest atmospheric pressure are September and October (29.76"Hg).
Average wind speed in September
Koyukuk, AK
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is September (5.2mph).
The calmest month (with the lowest average wind speed) is January (4.6mph).
Average humidity in September
Koyukuk, AK
- Average humidity in September: 82%
The months with the highest relative humidity are January, February and March (96%).
The month with the lowest relative humidity is June (59%).
Average rainfall in September
Koyukuk, AK
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is August (2.05").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Koyukuk, AK
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is August (19 days).
The months with the least rainy days are January and February (2.3 days).
Average snowfall in September
Koyukuk, AK
- Average snowfall in September: 0.55"
The month with the highest snowfall is December (8.62").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Koyukuk, AK
- Average snowfall days in September: 2.3 days
The month with the highest number of snowfall days is March (20.3 days).
The months with the least snowfall days are June and July (0 days).
Average daylight in September /
Average sunshine in September
Koyukuk, AK
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 21h and 30min).
The month with the shortest days is December (Average daylight: 4h and 0min).
- Average sunshine in September: 5h and 1min
The month with the most sunshine is May (Average sunshine: 8h and 6min).
The month with the least sunshine is December (Average sunshine: 2h and 18min).
Average sunshine days in September
Koyukuk, AK
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is January (18 days).
The month with the least sunshine days is April (6.5 days).
Average UV index in September
Koyukuk, AK
- Average UV index in September: 2
The months with the highest UV index are May, June and July (UV index 4).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in September
Koyukuk, AK
- Average cloud cover in September: 59
The month with the most cloud cover is April (Cloud cover 77).
The month with the least cloud cover is June (Cloud cover 47).
Average visibility in September
Koyukuk, AK
- Average visibility in September: 5mi
The months with the highest visibility are June and July (6mi).
The months with the lowest visibility are January, February, March, April and December (2mi).
Koyukuk, Alaska, USA
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