August Weather in Iowa, United States

Last updated: June 24, 2025

In Iowa, United States, the average temperature in August hovers around 28°C (83°F). Temperatures can range from a pleasant 20°C (69°F) to a sizzling 37°C (98°F). With an average precipitation of 179 mm (7.1 in) spread over 20 days, it's a good idea to pack an umbrella. Additionally, expect humidity levels to be around 71%, adding a touch of balminess to the air.

August Temperature in Iowa

In August in Iowa, the average temperature is 28°C (83°F). Maximums can reach 37°C (98°F) and minimums can drop to as low as 20°C (69°F). It's an ideal time for travelers who enjoy warm weather and outdoor activities.

August Weather in Iowa: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Iowa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iowa, August typically has an average temperature of 28°C (83°F), with highs reaching up to 37°C (98°F) and lows dropping to around 20°C (69°F).

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

August Precipitation in Iowa

In Iowa in August, the total precipitation amount is 179 mm (7.1 in), which falls over a span of 20 days.

August Precipitation Trends in Iowa

The chart displays monthly precipitation patterns in Iowa, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Iowa, August typically receives around 179 mm (7.1 inches) of precipitation spread over approximately 20 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Iowa

In Iowa in August, humidity is 71%. With an average temperature of 28°C (83°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable if you're not prepared for the stickiness and sweat that accompany such conditions.

August Average Humidity in Iowa

This chart illustrates the average monthly humidity levels in Iowa, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Iowa is approximately 71%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Iowa

In Iowa in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Iowa.

Maximum UV Index Levels in Iowa for August

The chart shows the monthly maximum UV Index (UVI) for Iowa in August, 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 August, the maximum UV index in Iowa typically reaches 11, which falls under the extreme exposure category.

Data source: Iowa August 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 August Weather in Iowa Compares to Other Months

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

This table compares monthly weather conditions in Iowa, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	117 mm (4.6 inches)	81%	moderate
February Weather	14°C (58°F)	107 mm (4.2 inches)	81%	very high
March Weather	18°C (65°F)	70 mm (2.7 inches)	79%	very high
April Weather	20°C (69°F)	155 mm (6.1 inches)	80%	very high
May Weather	25°C (77°F)	193 mm (7.6 inches)	81%	extreme
June Weather	27°C (81°F)	163 mm (6.4 inches)	76%	extreme
July Weather	28°C (83°F)	158 mm (6.2 inches)	73%	extreme
August Weather	28°C (83°F)	179 mm (7.1 inches)	71%	extreme
September Weather	26°C (80°F)	163 mm (6.4 inches)	72%	very high
October Weather	22°C (72°F)	122 mm (4.8 inches)	73%	very high
November Weather	16°C (60°F)	75 mm (2.9 inches)	83%	high
December Weather	14°C (57°F)	119 mm (4.7 inches)	88%	moderate