September weather forecast and climate
Sterling, AK

Weather in September

September, the first month of the autumn, in Sterling, is also a fresh month, with average temperature ranging between min 42.8°F (6°C) and max 54.3°F (12.4°C).

Temperature

In Sterling, Alaska, the average high-temperature slightly decreases, from an enjoyable 63.1°F (17.3°C) in August, to a cool 54.3°F (12.4°C). The average low-temperature, in September, is 42.8°F (6°C).

Humidity

In September, the average relative humidity in Sterling, Alaska, is 80%.

Rainfall

In September, the rain falls for 17.3 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. Throughout the year, in Sterling, there are 135.9 rainfall days, and 12.4" (315mm) 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 0.4 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, in Sterling, there are 65.1 snowfall days, and 23.27" (591mm) of snow is accumulated.

Daylight

In Sterling, Alaska, the average length of the day in September is 12.8h.

Sunshine

The average sunshine in September is 6.8h.

UV index

In September, the average daily maximum UV index in Sterling is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Sterling?

The average high-temperature, in September, is 54.3°F (12.4°C), while the average low-temperature is 42.8°F (6°C).

What is the average humidity in September in Sterling?

In Sterling, Alaska, the average relative humidity in September is 80%.

How much does it rain in Sterling in September?

In Sterling, Alaska, in September, it is raining for 17.3 days, with typically 1.61" (41mm) of accumulated precipitation.

When does it start to snow in Sterling?

September is the first month it typically snows in Sterling, Alaska. Throughout September, in the average 0.4 snowfall days, it receives 0.16" (4mm) of snow.

How many hours of daylight does Sterling have in September?

In Sterling, the average length of the day in September is 12.8h.

How long on average sun shines in September in Sterling?

In September, the average sunshine in Sterling, Alaska, is 6.8h.

What is the UV index intensity in September in Sterling?

The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.

Average temperature in September
Sterling, AK

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).

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Average pressure in September
Sterling, AK

Average pressure in September - Sterling, AK
  • Average pressure in September: 29.73"

The month with the highest atmospheric pressure is July (29.96").
Months with the lowest atmospheric pressure are November and December (29.64").

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Average wind speed in September
Sterling, AK

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).

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Average humidity in September
Sterling, AK

Average humidity in September - Sterling, AK
  • Average humidity in September: 80%

Months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (64%).

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Average rainfall in September
Sterling, AK

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").

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Average rainfall days in September
Sterling, AK

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).

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Average snowfall in September
Sterling, AK

Average snowfall in September - Sterling, AK
  • Average snowfall in September: 0.16"

The month with the highest snowfall is February (5.31").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Sterling, AK

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).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Sterling, AK

Average daylight in September / Average sunshine in September - Sterling, AK
  • Average daylight in September: 12.8h

The month with the longest days is June (Average daylight: 18.9h).
The month with the shortest days is December (Average daylight: 5.9h).

  • Average sunshine in September: 6.8h

The month with the most sunshine is June (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 3.3h).

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Average sunshine days in September
Sterling, AK

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).

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Average UV index in September
Sterling, AK

Average UV index in September - Sterling, AK
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 4).
Months with the lowest UV index are February and November (UV index 1).

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Average cloud cover in September
Sterling, AK

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).

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Average visibility in September
Sterling, AK

Average visibility in September - Sterling, AK
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February and March (4mi).

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