September weather forecast
Denali National Park and Preserve, AK

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Wonder Lake in Denali National Park and Preserve, Alaska
Wonder Lake in Denali National Park and Preserve, Alaska

Weather in September

September represents the shift to fall in Denali National Park and Preserve with a significant change in weather dynamics. A particular characteristic of September is the retreat of daylight hours to 12.9 from August’s high of 16.1. The descent in temperatures is noticeable, given the colder days and nights. The rainfall also drops to 1.8" (46mm), marking a decrease in precipitation as winter approaches. Weather in September is distinguished by shorter days, lower temperatures, and decreased rainfall.

Temperature

Onset of September comes with a temperature decline, the average high falling from a fresh 53.6°F (12°C) in August to a chilly 42.8°F (6°C). Nighttime temperatures in September average to a freezing cold 26.6°F (-3°C) in Denali National Park and Preserve.

Rainfall

In Denali National Park and Preserve, in September, during 15 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. In Denali National Park and Preserve, during the entire year, the rain falls for 145 days and collects up to 16.85" (428mm) of precipitation.

Daylight

In Denali National Park and Preserve, the average length of the day in September is 12h and 56min.
On the first day of September in Denali National Park and Preserve, sunrise is at 6:53 am and sunset at 9:15 pm. On the last day of the month, sunrise is at 8:12 am and sunset at 7:36 pm AKDT.

Sunshine

The average sunshine in September in Denali National Park and Preserve is 5h.

UV index

In September, the average daily maximum UV index in Denali National Park and Preserve is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 2 translates into these guidelines:
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. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Enhance your sun protection with tightly woven, yet airy clothing.
Updated: Feb 9, 2024 | Published by: Weather Atlas | About Us / Weather Forecasting / Data Sources

Frequently asked questions

Is September cold in Denali National Park and Preserve?

The high-temperature in Denali National Park and Preserve, Alaska, during September is 42.8°F (6°C) and the low-temperature is 26.6°F (-3°C).

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

In September, in Denali National Park and Preserve, Alaska, the rain falls for 15 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

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

The average day length in September in Denali National Park and Preserve is 12h and 56min.

When are sunrise and sunset in September in Denali National Park and Preserve?

In September, on the first day of the month, sunrise is at 6:53 am and sunset at 9:15 pm. On the last day of the month, sunrise is at 8:12 am and sunset at 7:36 pm AKDT.

How many hours of sunshine does Denali National Park and Preserve have in September?

The average sunshine duration in September in Denali National Park and Preserve is 5h.

What is the UV index intensity in September in Denali National Park and Preserve?

In Denali National Park and Preserve, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Denali National Park and Preserve, AK

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

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

Average rainfall days in September
Denali National Park and Preserve, AK

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

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

Average daylight in September /
Average sunshine in September
Denali National Park and Preserve, AK

Average daylight in September / Average sunshine in September - Denali National Park and Preserve, AK
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 20h and 12min).
The month with the shortest days is December (Average daylight: 4h and 54min).

  • Average sunshine in September: 5h

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

Average UV index in September
Denali National Park and Preserve, AK

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

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

Denali National Park and Preserve, Alaska, USA

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