September Weather in Fort Yukon, United States

Last updated: June 24, 2025

In September, the average temperature in Fort Yukon, United States hovers around 7°C (45°F). While chilly mornings can dip to a brisk -9°C (15°F), afternoons may warm up to a pleasant 21°C (71°F). Be prepared for 30 mm (1.2 in) of precipitation spread over 7 days and a high average humidity of 92%, creating a cozy, albeit damp atmosphere.

September Temperature in Fort Yukon

In September in Fort Yukon, the average temperature is 7°C (45°F). The maximum can reach 21°C (71°F) and the minimum can be as low as -9°C (15°F). Thus, travelers should be prepared for a wide range of temperatures and pack accordingly.

September Weather in Fort Yukon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fort Yukon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Yukon, September typically has an average temperature of 7°C (45°F), with highs reaching up to 21°C (71°F) and lows dropping to around -9°C (15°F).

Data source: Temperature data for Fort Yukon generated using information from the Copernicus Climate Change Service.

September Precipitation in Fort Yukon

In Fort Yukon in September, the total precipitation amount is 30 mm (1.2 in) over a span of 7 days.

September Precipitation Trends in Fort Yukon

The chart displays monthly precipitation patterns in Fort Yukon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Fort Yukon, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Fort Yukon

In Fort Yukon in September, humidity is 92%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities feel heavier and less enjoyable for traveling.

September Average Humidity in Fort Yukon

This chart illustrates the average monthly humidity levels in Fort Yukon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Fort Yukon is approximately 92%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fort Yukon

In Fort Yukon in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Fort Yukon, you can check the information here.

Maximum UV Index Levels in Fort Yukon for September

The chart shows the monthly maximum UV Index (UVI) for Fort Yukon in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Fort Yukon typically reaches 3, which falls under the moderate exposure category.

Data source: Fort Yukon September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Fort Yukon Compares to Other Months

Weather in Fort Yukon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fort Yukon, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Fort Yukon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-26°C (-14°F)	10 mm (0.4 inches)	98%	low
February Weather	-25°C (-12°F)	13 mm (0.5 inches)	97%	low
March Weather	-15°C (5°F)	11 mm (0.4 inches)	93%	low
April Weather	-3°C (26°F)	10 mm (0.4 inches)	89%	moderate
May Weather	10°C (50°F)	22 mm (0.9 inches)	83%	moderate
June Weather	18°C (64°F)	27 mm (1.1 inches)	84%	moderate
July Weather	19°C (67°F)	27 mm (1.1 inches)	86%	moderate
August Weather	14°C (57°F)	61 mm (2.4 inches)	90%	moderate
September Weather	7°C (45°F)	30 mm (1.2 inches)	92%	moderate
October Weather	-2°C (28°F)	23 mm (0.9 inches)	98%	low
November Weather	-17°C (2°F)	16 mm (0.6 inches)	100%	low
December Weather	-22°C (-7°F)	20 mm (0.8 inches)	100%	low