Denali National Park and Preserve
Alaska, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Denali National Park and Preserve, AK

Wonder Lake in Denali National Park and Preserve, Alaska
Wonder Lake in Denali National Park and Preserve, Alaska
September, the first month of the autumn, in Denali National Park and Preserve, is also a frosty month, with average temperature varying between 26.6°F (-3°C) and 42.8°F (6°C).

Temperature

In September, the average high-temperature drops, from a cool 53.6°F (12°C) in August, to a chilly 42.8°F (6°C). In Denali National Park and Preserve, the average low-temperature is 26.6°F (-3°C).

Rainfall

In Denali National Park and Preserve, it is raining for 15 days, with typically 1.8" (45mm) of accumulated precipitation. Throughout the year, there are 145 rainfall days, and 16.9" (428mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12.9h.

Sunshine

In Denali National Park and Preserve, the average sunshine in September is 5h.

UV index

In September, the average daily maximum UV index in Denali National Park and Preserve is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in September interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Denali National Park and Preserve?

The average high-temperature, in September, is 42.8°F (6°C), while the average low-temperature is 26.6°F (-3°C).

How many days does it rain in September in Denali National Park and Preserve?

In Denali National Park and Preserve, Alaska, during September, the rain falls for 15 days and regularly aggregates up to 1.8" (45mm) of precipitation.

What is the average length of the day in September in Denali National Park and Preserve?

In September, the average length of the day is 12.9h.

How long on average sun shines in September in Denali National Park and Preserve?

In Denali National Park and Preserve, Alaska, the average sunshine in September is 5h.

How high is the UV index in September in Denali National Park and Preserve?

The average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Denali National Park and Preserve, AK
  • Average high temperature in September: 43°F

The warmest month (with the highest average high temperature) is July (57°F).
The month with the lowest average high temperature is January (5°F).

  • Average low temperature in September: 27°F

The month with the highest average low temperature is July (39°F).
The coldest month (with the lowest average low temperature) is January (-13°F).

Average rainfall in September - Denali National Park and Preserve, AK
  • Average rainfall in September: 1.8"

The wettest month (with the highest rainfall) is July (3").
Driest months (with the lowest rainfall) are April and May (0.7").

Average rainfall days in September - Denali National Park and Preserve, AK
  • Average rainfall days in September: 15 days

Months with the highest number of rainy days are July and August (16 days).
The month with the lowest number of rainy days is April (8 days).

Average daylight in September / Average sunshine in September - Denali National Park and Preserve, AK
  • Average daylight in September: 12.9h

The month with the longest days is June (Average daylight: 20.2h).
The month with shortest days is December (Average daylight: 4.9h).

  • Average sunshine in September: 5h

Months with most sunshine are May and June (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 2).

Average UV index in September - Denali National Park and Preserve, AK
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 0).