September Weather in Island Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Island Falls, United States hovers around 15°C (59°F). Visitors should prepare for a range of temperatures, with a minimum dipping to -2°C (28°F) and a maximum soaring to 33°C (91°F). Expect 86 mm (3.4 in) of precipitation spread over approximately 8 days, contributing to an average humidity level of 77%.

September Temperature in Island Falls

In September in Island Falls, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F), and minimums can be as low as -2°C (28°F). This variation in temperature makes it essential to pack layers and prepare for diverse weather conditions while traveling.

September Weather in Island Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Island Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Island Falls, September typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (91°F) and lows dropping to around -2°C (28°F).

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

September Precipitation in Island Falls

In Island Falls in September, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 days.

September Precipitation Trends in Island Falls

The chart displays monthly precipitation patterns in Island Falls, 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 Island Falls, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 8 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 Island Falls

In Island Falls in September, humidity is 77%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it essential to stay hydrated and choose light, breathable clothing for comfortable travel.

September Average Humidity in Island Falls

This chart illustrates the average monthly humidity levels in Island Falls, 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 Island Falls is approximately 77%, 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 Island Falls

In Island Falls in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Island Falls.

Maximum UV Index Levels in Island Falls for September

The chart shows the monthly maximum UV Index (UVI) for Island Falls 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 Island Falls typically reaches 7, which falls under the high exposure category.

Data source: Island Falls 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 Island Falls Compares to Other Months

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

This table compares monthly weather conditions in Island Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	95 mm (3.8 inches)	88%	low
February Weather	-7°C (19°F)	84 mm (3.3 inches)	88%	moderate
March Weather	-3°C (27°F)	80 mm (3.1 inches)	85%	moderate
April Weather	4°C (40°F)	120 mm (4.7 inches)	81%	high
May Weather	11°C (53°F)	104 mm (4.1 inches)	76%	very high
June Weather	17°C (63°F)	86 mm (3.4 inches)	74%	very high
July Weather	20°C (68°F)	93 mm (3.6 inches)	74%	very high
August Weather	19°C (67°F)	77 mm (3.0 inches)	74%	very high
September Weather	15°C (59°F)	86 mm (3.4 inches)	77%	high
October Weather	8°C (47°F)	121 mm (4.8 inches)	82%	moderate
November Weather	1°C (33°F)	113 mm (4.5 inches)	85%	moderate
December Weather	-6°C (22°F)	114 mm (4.5 inches)	84%	low