September weather forecast
Denali National Park and Preserve, AK

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.