September Weather in Keokuk, United States

Last updated: June 24, 2025

In Keokuk, United States, the average temperature in September hovers around 21°C (70°F), making it a pleasant time to visit. Expect temperatures to range from a cool 6°C (44°F) to a warm 35°C (95°F). Be prepared for some rain, with about 99 mm (3.9 in) of precipitation expected over 8 days and a comfortable average humidity of 78%.

September Temperature in Keokuk

In September in Keokuk, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop as low as 6°C (44°F). This varied climate makes Keokuk an ideal destination for travelers looking to experience both warm and cool weather during their visit.

September Weather in Keokuk: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Keokuk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keokuk, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Keokuk

In Keokuk in September, the precipitation amount is 99 mm (3.9 in) spread over 8 days.

September Precipitation Trends in Keokuk

The chart displays monthly precipitation patterns in Keokuk, 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 Keokuk, September typically receives around 99 mm (3.9 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 Keokuk

In Keokuk in September, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

September Average Humidity in Keokuk

This chart illustrates the average monthly humidity levels in Keokuk, 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 Keokuk is approximately 78%, 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 Keokuk

In Keokuk 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 Keokuk.

Maximum UV Index Levels in Keokuk for September

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

Data source: Keokuk 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 Keokuk Compares to Other Months

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

This table compares monthly weather conditions in Keokuk, 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 (27°F)	56 mm (2.2 inches)	81%	moderate
February Weather	-2°C (29°F)	58 mm (2.3 inches)	81%	moderate
March Weather	6°C (43°F)	100 mm (3.9 inches)	81%	high
April Weather	11°C (52°F)	95 mm (3.7 inches)	82%	very high
May Weather	18°C (65°F)	169 mm (6.7 inches)	78%	very high
June Weather	24°C (76°F)	121 mm (4.8 inches)	81%	extreme
July Weather	26°C (79°F)	86 mm (3.4 inches)	79%	very high
August Weather	24°C (75°F)	85 mm (3.3 inches)	77%	very high
September Weather	21°C (70°F)	99 mm (3.9 inches)	78%	very high
October Weather	13°C (56°F)	118 mm (4.6 inches)	78%	high
November Weather	5°C (41°F)	50 mm (2.0 inches)	87%	moderate
December Weather	1°C (35°F)	42 mm (1.7 inches)	84%	low