September Weather in Iowa Falls, United States

Last updated: June 24, 2025

In September, the average temperature in Iowa Falls, United States hovers around 19°C (67°F). Residents and visitors can expect temperatures ranging from a chilly 3°C (38°F) to a warm 34°C (93°F). During this month, 119 mm (4.7 in) of precipitation typically falls over 10 days, contributing to an average humidity level of 75%.

September Temperature in Iowa Falls

In September in Iowa Falls, the average temperature is 19°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (38°F). This climate makes it an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Iowa Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iowa Falls, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Iowa Falls

In Iowa Falls in September, the total precipitation amount is 119 mm (4.7 in) over the span of 10 days.

September Precipitation Trends in Iowa Falls

The chart displays monthly precipitation patterns in Iowa 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 Iowa Falls, September typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Iowa Falls

In Iowa Falls in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Iowa Falls

This chart illustrates the average monthly humidity levels in Iowa 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 Iowa Falls is approximately 75%, 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 Iowa Falls

In Iowa Falls in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Iowa Falls.

Maximum UV Index Levels in Iowa Falls for September

The chart shows the monthly maximum UV Index (UVI) for Iowa 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 Iowa Falls typically reaches 8, which falls under the very high exposure category.

Data source: Iowa 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 Iowa Falls Compares to Other Months

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

This table compares monthly weather conditions in Iowa Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	37 mm (1.4 inches)	82%	moderate
February Weather	-7°C (20°F)	47 mm (1.8 inches)	84%	moderate
March Weather	3°C (37°F)	71 mm (2.8 inches)	80%	high
April Weather	8°C (47°F)	80 mm (3.1 inches)	81%	very high
May Weather	16°C (61°F)	158 mm (6.2 inches)	74%	very high
June Weather	23°C (73°F)	117 mm (4.6 inches)	80%	extreme
July Weather	24°C (75°F)	99 mm (3.9 inches)	80%	very high
August Weather	22°C (72°F)	91 mm (3.6 inches)	77%	very high
September Weather	19°C (67°F)	119 mm (4.7 inches)	75%	very high
October Weather	10°C (51°F)	125 mm (4.9 inches)	80%	high
November Weather	2°C (36°F)	45 mm (1.8 inches)	87%	moderate
December Weather	-2°C (29°F)	35 mm (1.4 inches)	83%	moderate