September Weather in American Falls, United States

Last updated: June 24, 2025

In September, the average temperature in American Falls, United States sits at a pleasant 17°C (63°F). However, prepare for a range, with minimums dipping to 1°C (34°F) and maximums soaring up to 36°C (97°F). Expect about 27 mm (1.1 in) of precipitation spread over 4 days, and enjoy an average humidity of 46% for a comfortable climate experience.

September Temperature in American Falls

In September in American Falls, the average temperature is 17°C (63°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 1°C (34°F). This variability in temperature makes it essential to pack accordingly for a comfortable travel experience.

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

The chart illustrates September temperature patterns in American Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In American Falls, September typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (34°F).

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

September Precipitation in American Falls

In American Falls in September, the total precipitation amount is 27 mm (1.1 in) over a span of 4 days.

September Precipitation Trends in American Falls

The chart displays monthly precipitation patterns in American 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 American Falls, September typically receives around 27 mm (1.1 inches) of precipitation spread over approximately 4 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 American Falls

In American Falls in September, humidity is 46%. With an average temperature of 17°C (63°F), this humidity feels like a mild embrace—comfortable for exploring the sights, though you might notice a slight heaviness in the air that encourages a leisurely pace as you take in the vibrant surroundings.

September Average Humidity in American Falls

This chart illustrates the average monthly humidity levels in American 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 American Falls is approximately 46%, 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 American Falls

In American Falls in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in American Falls.

Maximum UV Index Levels in American Falls for September

The chart shows the monthly maximum UV Index (UVI) for American 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 American Falls typically reaches 9, which falls under the very high exposure category.

Data source: American 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 American Falls Compares to Other Months

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

This table compares monthly weather conditions in American Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	43 mm (1.7 inches)	91%	moderate
February Weather	-2°C (29°F)	55 mm (2.2 inches)	92%	moderate
March Weather	3°C (38°F)	46 mm (1.8 inches)	85%	high
April Weather	8°C (46°F)	51 mm (2.0 inches)	76%	very high
May Weather	13°C (56°F)	51 mm (2.0 inches)	66%	very high
June Weather	19°C (67°F)	24 mm (0.9 inches)	62%	extreme
July Weather	24°C (76°F)	13 mm (0.5 inches)	53%	extreme
August Weather	22°C (73°F)	16 mm (0.6 inches)	42%	very high
September Weather	17°C (63°F)	27 mm (1.1 inches)	46%	very high
October Weather	8°C (47°F)	38 mm (1.5 inches)	64%	high
November Weather	3°C (37°F)	30 mm (1.2 inches)	83%	moderate
December Weather	-3°C (28°F)	43 mm (1.7 inches)	87%	moderate