September Weather in Keithsburg, United States

Last updated: June 24, 2025

In September, the average temperature in Keithsburg, United States hovers around 21°C (70°F). Expect minimums dipping to 7°C (44°F) and maximums soaring up to 35°C (95°F). With about 100 mm (3.9 in) of precipitation spread across 9 days, the month also features a relatively high average humidity of 78%. Be prepared for a mix of warm days and occasional rain!

September Temperature in Keithsburg

In September, in Keithsburg, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F) and minimums can be as low as 7°C (44°F). It's an ideal time to visit for those who enjoy mild weather but be prepared for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Keithsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keithsburg, 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 7°C (44°F).

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

September Precipitation in Keithsburg

In Keithsburg in September, the precipitation amount is 100 mm (3.9 in) spread over 9 days.

September Precipitation Trends in Keithsburg

The chart displays monthly precipitation patterns in Keithsburg, 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 Keithsburg, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 9 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 Keithsburg

In Keithsburg 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 Keithsburg

This chart illustrates the average monthly humidity levels in Keithsburg, 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 Keithsburg 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 Keithsburg

In Keithsburg 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 Keithsburg.

Maximum UV Index Levels in Keithsburg for September

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

Data source: Keithsburg 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 Keithsburg Compares to Other Months

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

This table compares monthly weather conditions in Keithsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	55 mm (2.2 inches)	81%	moderate
February Weather	-2°C (28°F)	61 mm (2.4 inches)	81%	moderate
March Weather	5°C (42°F)	97 mm (3.8 inches)	81%	high
April Weather	10°C (51°F)	92 mm (3.6 inches)	82%	very high
May Weather	18°C (64°F)	165 mm (6.5 inches)	78%	very high
June Weather	24°C (75°F)	133 mm (5.2 inches)	81%	extreme
July Weather	25°C (78°F)	80 mm (3.1 inches)	79%	very high
August Weather	24°C (75°F)	67 mm (2.6 inches)	77%	very high
September Weather	21°C (70°F)	100 mm (3.9 inches)	78%	very high
October Weather	13°C (55°F)	128 mm (5.0 inches)	78%	high
November Weather	4°C (40°F)	51 mm (2.0 inches)	87%	moderate
December Weather	1°C (34°F)	47 mm (1.9 inches)	84%	low