September weather forecast
Willow, AK

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Weather in September

September, the first month of the autumn in Willow, is still a cool month, with temperature in the range of an average high of 54.9°F (12.7°C) and an average low of 41.2°F (5.1°C).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from an enjoyable 63.7°F (17.6°C) in August to a cool 54.9°F (12.7°C). During the month of September, Willow experiences a steady low-temperature average of 41.2°F (5.1°C).

Humidity

The average relative humidity in September is 77%.

Rainfall

The month with the most rainfall is September, when the rain falls for 16 days and typically aggregates up to 2.13" (54mm) of precipitation.

Snowfall

Months with snowfall in Willow are January through May, September through December. September is the first month it typically snows in Willow. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow. In Willow, during the entire year, snow falls for 56.9 days and aggregates up to 26.54" (674mm) of snow.

Daylight

In September, the average length of the day in Willow is 12h and 53min.
On the first day of the month, sunrise is at 6:52 am and sunset at 9:06 pm. On the last day of September, in Willow, sunrise is at 8:06 am and sunset at 7:32 pm AKDT.

Sunshine

The average sunshine in September in Willow is 7.4h.

UV index

In September, the average daily maximum UV index in Willow is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 2 during September leads to these advisories:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the temperature in September in Willow?

The average high-temperature and low-temperature during September are 54.9°F (12.7°C) and 41.2°F (5.1°C) respectively.

What is the average humidity in September in Willow?

In Willow, Alaska, the average relative humidity in September is 77%.

What is the wettest month in Willow?

September is the month with the most rainfall. Rain falls for 16 days and accumulates 2.13" (54mm) of precipitation.

How many days does it rain in September in Willow?

In Willow, Alaska, in September, during 16 rainfall days, 2.13" (54mm) of precipitation is typically accumulated.

When does it start to snow in Willow?

September is the first month it typically snows in Willow. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow.

What is the average length of the day in September in Willow?

In September, the average day length in Willow is 12h and 53min.

What time are sunrise and sunset in September in Willow?

On the first day of September in Willow, Alaska, sunrise is at 6:52 am and sunset at 9:06 pm. On the last day of the month, sunrise is at 8:06 am and sunset at 7:32 pm AKDT.

How long on average sun shines in September in Willow?

The average sunshine duration in September is 7.4h.

What is the UV index intensity in September in Willow?

The average daily maximum UV index in September in Willow is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Willow, AK

Average temperature in September - Willow, AK
  • Average high temperature in September: 54.9°F

The warmest month (with the highest average high temperature) is July (67.6°F).
The month with the lowest average high temperature is January (17.8°F).

  • Average low temperature in September: 41.2°F

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is January (8.6°F).

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Average pressure in September
Willow, AK

Average pressure in September - Willow, AK
  • Average pressure in September: 29.75"Hg

The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.7"Hg).

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Average wind speed in September
Willow, AK

Average wind speed in September - Willow, AK
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is November (5.1mph).
The calmest month (with the lowest average wind speed) is April (4.3mph).

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Average humidity in September
Willow, AK

Average humidity in September - Willow, AK
  • Average humidity in September: 77%

The month with the highest relative humidity is March (89%).
The month with the lowest relative humidity is May (61%).

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Average rainfall in September
Willow, AK

Average rainfall in September - Willow, AK
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is September (2.13").
The driest month (with the least rainfall) is April (0.63").

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Average rainfall days in September
Willow, AK

Average rainfall days in September - Willow, AK
  • Average rainfall days in September: 16 days

The month with the highest number of rainy days is August (19.3 days).
The month with the least rainy days is February (4.8 days).

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Average snowfall in September
Willow, AK

Average snowfall in September - Willow, AK
  • Average snowfall in September: 0.2"

The month with the highest snowfall is December (5.87").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Willow, AK

Average snowfall days in September - Willow, AK
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (11.4 days).
The 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
Willow, AK

Average daylight in September / Average sunshine in September - Willow, AK
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 19h and 30min).
The month with the shortest days is December (Average daylight: 5h and 24min).

  • Average sunshine in September: 7h and 2min

The month with the most sunshine is May (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).

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Average sunshine days in September
Willow, AK

Average sunshine days in September - Willow, AK
  • Average sunshine days in September: 11.8 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is August (9.7 days).

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Average UV index in September
Willow, AK

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

The months with the highest UV index are May, June and July (UV index 4).
The months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in September
Willow, AK

Average cloud cover in September - Willow, AK
  • Average cloud cover in September: 46

The months with the most cloud cover are April and August (Cloud cover 48).
The month with the least cloud cover is January (Cloud cover 40).

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Average visibility in September
Willow, AK

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

The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is March (4mi).

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Willow, Alaska, USA

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