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
With September's arrival, Koyukuk's weather changes as the average high-temperature falls from a refreshing 60.4°F (15.8°C) in August to a chilly 48.7°F (9.3°C). Koyukuk reports a consistent average low-temperature of 35.6°F (2°C) throughout September nights.Humidity
The average relative humidity in September is 82%.Rainfall
In Koyukuk, in September, it is raining for 15 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, there are 116.7 rainfall days, and 14.8" (376mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 2.3 snowfall days, it receives 0.55" (14mm) of snow. Throughout the year, there are 115.2 snowfall days, and 43.07" (1094mm) of snow is accumulated.Daylight
The average length of the day in September in Koyukuk is 13h and 0min.On the first day of September, 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
In Koyukuk, the average sunshine in September is 5.2h.UV index
In Koyukuk, Alaska, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 2 leads to the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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?
What time are sunrise and sunset in September?
How many hours of sunshine does Koyukuk have in September?
What is the UV index intensity in September?
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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