September weather forecast
Upernavik, Greenland

As September steps in, Upernavik slowly begins to embrace the colder half of the year. A considerable decline in temperature from August to September ushers in the first traces of chills. Weather transforms remarkably, as it moves away from the summer patterns, signifying the onset of autumn. The rainfall carries a significant increase to 38mm (1.5"), becoming a distinguishing feature of September's weather palette. Nonetheless, daylight hours see a reduction, offering Upernavik's mesmerizing twilight skies for prolonged periods.

Temperature

With the arrival of September, Upernavik notices a mild change in the average high-temperature, sliding from August's frosty 7.7°C (45.9°F) to a cold 3°C (37.4°F). During the nights of September, the average low-temperature holds at a subzero cold -1.1°C (30°F).

Rainfall

September is the month with the most rainfall in Upernavik. Rain falls for 11 days and accumulates 38mm (1.5") of precipitation.

Sea temperature

In September, the average sea temperature in Upernavik is 3.8°C (38.8°F).
Note: In the water-based sport of swimming, this state is life-threatening and exceedingly dangerous. The freezing water causes severe discomfort, leading to rapid hyperventilation. A specialized swimsuit is compulsory to avert thermal damage.

Daylight

The average length of the day in September is 13h and 34min.
On the first day of the month, sunrise is at 06:44 and sunset at 22:44. On the last day of September, sunrise is at 09:03 and sunset at 20:04 -01.

Sunshine

The average sunshine in September is 4h.

UV index

The average daily maximum UV index in September is 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 1 in September transforms into the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.