September weather forecast and climate
Old Harbor, AK

Weather in September

September, the first month of the autumn, in Old Harbor, is also a fresh month, with temperature in the range of an average low of 47.7°F (8.7°C) and an average high of 53.1°F (11.7°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a fresh 53.1°F (11.7°C). The average low-temperature, in September, is 47.7°F (8.7°C).

Humidity

In Old Harbor, the average relative humidity is 83%.

Rainfall

In Old Harbor, in September, it is raining for 17.6 days, with typically 3.27" (83mm) of accumulated precipitation. Throughout the year, there are 171.2 rainfall days, and 37.32" (948mm) 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 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 35.1 snowfall days, and 13.74" (349mm) of snow is accumulated.

Daylight

The average length of the day in Old Harbor is 12.7h.

Sunshine

In Old Harbor, the average sunshine is 5.8h.

UV index

June through September, with an average maximum UV index of 3, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 3 in September transform into the following instructions:
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. 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 Old Harbor?

The average high-temperature, in September, in Old Harbor, Alaska, is 53.1°F (11.7°C), while the average low-temperature is 47.7°F (8.7°C).

What is the average humidity in September in Old Harbor?

In September, the average relative humidity in Old Harbor, Alaska, is 83%.

How many days does it rain in September in Old Harbor?

In Old Harbor, Alaska, in September, it is raining for 17.6 days, with typically 3.27" (83mm) of accumulated precipitation.

When does it start snowing in Old Harbor?

September is the first month it typically snows in Old Harbor, Alaska. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

What is the average length of the day in September in Old Harbor?

In September, the average length of the day in Old Harbor is 12.7h.

How many hours of sunshine does Old Harbor have in September?

The average sunshine in September in Old Harbor is 5.8h.

What are the months with the highest UV index in Old Harbor?

June through September, with an average maximum UV index of 3, are months with the highest UV index.

What is the UV index reading in September in Old Harbor?

In Old Harbor, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Old Harbor, AK

Average temperature in September - Old Harbor, AK
  • Average high temperature in September: 53.1°F

The warmest month (with the highest average high temperature) is August (57.6°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in September: 47.7°F

The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is March (30.6°F).

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Average pressure in September
Old Harbor, AK

Average pressure in September - Old Harbor, AK
  • Average pressure in September: 29.71"

The month with the highest atmospheric pressure is July (29.98").
The month with the lowest atmospheric pressure is December (29.55").

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Average wind speed in September
Old Harbor, AK

Average wind speed in September - Old Harbor, AK
  • Average wind speed in September: 10.3mph

The windiest month (with the highest average wind speed) is December (14.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

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Average humidity in September
Old Harbor, AK

Average humidity in September - Old Harbor, AK
  • Average humidity in September: 83%

The month with the highest relative humidity is July (86%).
Months with the lowest relative humidity are March and November (80%).

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Average rainfall in September
Old Harbor, AK

Average rainfall in September - Old Harbor, AK
  • Average rainfall in September: 3.27"

The wettest months (with the highest rainfall) are October and November (4.53").
The driest month (with the least rainfall) is July (1.85").

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Average rainfall days in September
Old Harbor, AK

Average rainfall days in September - Old Harbor, AK
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is September (17.6 days).
The month with the least rainy days is March (10.8 days).

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Average snowfall in September
Old Harbor, AK

Average snowfall in September - Old Harbor, AK
  • Average snowfall in September: 0.08"

The month with the highest snowfall is March (3.15").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Old Harbor, AK

Average snowfall days in September - Old Harbor, AK
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is March (8.5 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
Old Harbor, AK

Average daylight in September / Average sunshine in September - Old Harbor, AK
  • Average daylight in September: 12.7h

The month with the longest days is June (Average daylight: 17.8h).
The month with the shortest days is December (Average daylight: 6.8h).

  • Average sunshine in September: 5.8h

The month with the most sunshine is July (Average sunshine: 8.3h).
Months with the least sunshine are January and December (Average sunshine: 2.6).

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Average sunshine days in September
Old Harbor, AK

Average sunshine days in September - Old Harbor, AK
  • Average sunshine days in September: 11.5 days

The month with the most sunshine days is July (14.7 days).
The month with the least sunshine days is April (10.7 days).

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Average UV index in September
Old Harbor, AK

Average UV index in September - Old Harbor, AK
  • Average UV index in September: 3

Months with the highest UV index are June, July, August and September (UV index 3).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
Old Harbor, AK

Average cloud cover in September - Old Harbor, AK
  • Average cloud cover in September: 52

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 52).

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Average visibility in September
Old Harbor, AK

Average visibility in September - Old Harbor, AK
  • Average visibility in September: 6mi

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

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