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 brings with it an average high-temperature of a still cool 50.5°F (10.3°C), showing a negligible variation from the month before. Adak, during September nights, witnesses an average temperature marginally cooler than its daytime highs, at a frosty 48.2°F (9°C).Humidity
In September, the average relative humidity is 88%.Rainfall
In September, the rain falls for 17 days. Throughout September, 2.05" (52mm) of precipitation is accumulated. In Adak, during the entire year, the rain falls for 173.3 days and collects up to 27.4" (696mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Adak, the average length of the day in September is 12h and 37min.On the first day of September, sunrise is at 8:00 am and sunset at 9:32 pm. On the last day of the month, sunrise is at 8:47 am and sunset at 8:24 pm HDT.
Sunshine
The average sunshine in September is 4.4h.UV index
July through September, with an average maximum UV index of 3, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 3 in September suggests the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Adak in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Adak have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the month with the highest UV index?
How high is the UV index in September?
Average temperature in September
Adak, AK
- Average high temperature in September: 50.5°F
The warmest month (with the highest average high temperature) is August (52°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in September: 48.2°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is March (33.8°F).
Average pressure in September
Adak, AK
- Average pressure in September: 29.84"Hg
The month with the highest atmospheric pressure is July (29.95"Hg).
The month with the lowest atmospheric pressure is January (29.48"Hg).
Average wind speed in September
Adak, AK
- Average wind speed in September: 15.7mph
The windiest month (with the highest average wind speed) is February (21.2mph).
The calmest month (with the lowest average wind speed) is July (11.1mph).
Average humidity in September
Adak, AK
- Average humidity in September: 88%
The month with the highest relative humidity is July (94%).
The months with the lowest relative humidity are January and December (76%).
Average rainfall in September
Adak, AK
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is February (2.8").
The driest month (with the least rainfall) is June (1.3").
Average rainfall days in September
Adak, AK
- Average rainfall days in September: 17 days
The month with the highest number of rainy days is October (19.5 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in September
Adak, AK
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Adak, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Adak, AK
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 4h and 2min
The month with the most sunshine is October (Average sunshine: 5h and 6min).
The month with the least sunshine is December (Average sunshine: 2h and 6min).
Average sunshine days in September
Adak, AK
- Average sunshine days in September: 10.7 days
The month with the most sunshine days is June (12.8 days).
The month with the least sunshine days is February (6.3 days).
Average UV index in September
Adak, AK
- Average UV index in September: 3
The months with the highest UV index are July, August and September (UV index 3).
The months with the lowest UV index are January, February, March, April and December (UV index 1).
Average cloud cover in September
Adak, AK
- Average cloud cover in September: 67
The month with the most cloud cover is July (Cloud cover 85).
The month with the least cloud cover is October (Cloud cover 63).
Average visibility in September
Adak, AK
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, March, July, August and December (5mi).
Adak, Alaska, USA
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