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 the onset of September, Sterling's climate undergoes a slight change as the average high-temperature moves from an enjoyable 63.1°F (17.3°C) in August to a fresh 54.3°F (12.4°C). In Sterling, the September nights cool down to an average low of 42.8°F (6°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Sterling, in September, during 17.3 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Sterling, during the entire year, the rain falls for 135.9 days and collects up to 12.4" (315mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.16" (4mm) of snow. In Sterling, during the entire year, snow falls for 65.1 days and aggregates up to 23.27" (591mm) of snow.Daylight
In September, the average length of the day is 12h and 50min.On the first day of the month, sunrise is at 6:59 am and sunset at 9:06 pm. On the last day of September, in Sterling, sunrise is at 8:08 am and sunset at 7:36 pm AKDT.
Sunshine
In September, the average sunshine is 6.8h.UV index
In Sterling, Alaska, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 2 suggests these recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September in Sterling?
When does it start to snow?
How many hours of daylight does Sterling have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Sterling have in September?
What is the UV index intensity in September?
Average temperature in September
Sterling, AK
- Average high temperature in September: 54.3°F
The warmest month (with the highest average high temperature) is July (66.2°F).
The month with the lowest average high temperature is January (21.9°F).
- Average low temperature in September: 42.8°F
The month with the highest average low temperature is July (50°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in September
Sterling, AK
- Average pressure in September: 29.73"Hg
The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.64"Hg).
Average wind speed in September
Sterling, AK
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are November and December (6mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).
Average humidity in September
Sterling, AK
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (64%).
Average rainfall in September
Sterling, AK
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is October (1.77").
The driest month (with the least rainfall) is May (0.55").
Average rainfall days in September
Sterling, AK
- Average rainfall days in September: 17.3 days
The month with the highest number of rainy days is September (17.3 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Sterling, AK
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (5.31").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Sterling, AK
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is December (13.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Sterling, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 6h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in September
Sterling, AK
- Average sunshine days in September: 11 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is September (11 days).
Average UV index in September
Sterling, AK
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are February and November (UV index 1).
Average cloud cover in September
Sterling, AK
- Average cloud cover in September: 48
The month with the most cloud cover is December (Cloud cover 53).
The month with the least cloud cover is June (Cloud cover 45).
Average visibility in September
Sterling, AK
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and March (4mi).
Sterling, Alaska, USA
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