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 temperature drop, moving from a moderate 60.3°F (15.7°C) in August to a chilly 47.5°F (8.6°C). Throughout September, Alatna encounters an average temperature drop to a cold 33.1°F (0.6°C).Humidity
In September, the average relative humidity is 75%.Rainfall
In Alatna, Alaska, in September, during 11.3 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Alatna, during the entire year, the rain falls for 76.6 days and collects up to 9.72" (247mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 3.8 snowfall days, it receives 1.06" (27mm) of snow. Throughout the year, there are 88.7 snowfall days, and 35.59" (904mm) of snow is accumulated.Daylight
In September, the average length of the day is 13h and 5min.On the first day of the month, sunrise is at 6:47 am and sunset at 9:33 pm. On the last day of September, in Alatna, sunrise is at 8:22 am and sunset at 7:38 pm AKDT.
Sunshine
The average sunshine in September is 6.7h.UV index
The months with the lowest UV index are January, March, April, September, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high UV index of 1 in September translates into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
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?
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 long on average sun shines in September?
When is the lowest UV index?
What is the UV index reading in September?
Average temperature in September
Alatna, AK
- Average high temperature in September: 47.5°F
The warmest month (with the highest average high temperature) is July (68.2°F).
The month with the lowest average high temperature is January (-2.7°F).
- Average low temperature in September: 33.1°F
The month with the highest average low temperature is July (49.3°F).
The coldest month (with the lowest average low temperature) is January (-13.5°F).
Average pressure in September
Alatna, AK
- Average pressure in September: 29.8"Hg
The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is September (29.8"Hg).
Average wind speed in September
Alatna, AK
- Average wind speed in September: 4.5mph
The windiest months (with the highest average wind speed) are June and July (5.1mph).
The calmest month (with the lowest average wind speed) is February (4.1mph).
Average humidity in September
Alatna, AK
- Average humidity in September: 75%
The month with the highest relative humidity is April (93%).
The month with the lowest relative humidity is June (52%).
Average rainfall in September
Alatna, AK
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is August (1.5").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Alatna, AK
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is January (1.3 days).
Average snowfall in September
Alatna, AK
- Average snowfall in September: 1.06"
The month with the highest snowfall is December (6.54").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Alatna, AK
- Average snowfall days in September: 3.8 days
The month with the highest number of snowfall days is December (13.4 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Alatna, AK
- Average daylight in September: 13h and 1min
The month with the longest days is May (Average daylight: 19h and 48min).
The month with the shortest days is December (Average daylight: 2h and 36min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is June (Average sunshine: 0h and 36min).
Average sunshine days in September
Alatna, AK
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (22.7 days).
The month with the least sunshine days is August (14.2 days).
Average UV index in September
Alatna, AK
- Average UV index in September: 1
The months with the highest UV index are May, June and July (UV index 4).
The months with the lowest UV index are January, March, April, September, November and December (UV index 1).
Average cloud cover in September
Alatna, AK
- Average cloud cover in September: 52
The month with the most cloud cover is April (Cloud cover 58).
The month with the least cloud cover is June (Cloud cover 36).
Average visibility in September
Alatna, AK
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The month with the lowest visibility is April (3mi).
Alatna, Alaska, USA
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