September Weather in Chillicothe, United States

Last updated: June 24, 2025

In September, the average temperature in Chillicothe, United States hovers around 21°C (70°F), with a minimum dipping to 6°C (43°F) and a maximum soaring to 36°C (97°F). Expect about 98 mm (3.9 in) of precipitation spread over 8 days, while the average humidity remains comfortably high at 73%. Enjoy the diverse weather as you explore this captivating destination!

September Temperature in Chillicothe

In September in Chillicothe, the average temperature is 21°C (70°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 6°C (43°F). It's a great time for travelers who enjoy warm weather with a chance of cooler evenings.

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

The chart illustrates September temperature patterns in Chillicothe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chillicothe, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (97°F) and lows dropping to around 6°C (43°F).

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

September Precipitation in Chillicothe

In Chillicothe in September, the total precipitation amount is 98 mm (3.9 in), occurring over 8 days.

September Precipitation Trends in Chillicothe

The chart displays monthly precipitation patterns in Chillicothe, 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 Chillicothe, September typically receives around 98 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.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Chillicothe

In Chillicothe in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Chillicothe

This chart illustrates the average monthly humidity levels in Chillicothe, 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 Chillicothe is approximately 73%, 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 Chillicothe

In Chillicothe 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 Chillicothe.

Maximum UV Index Levels in Chillicothe for September

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

Data source: Chillicothe 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 Chillicothe Compares to Other Months

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

This table compares monthly weather conditions in Chillicothe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (33°F)	82 mm (3.2 inches)	88%	moderate
February Weather	3°C (37°F)	113 mm (4.4 inches)	88%	moderate
March Weather	7°C (45°F)	121 mm (4.8 inches)	87%	high
April Weather	12°C (54°F)	131 mm (5.1 inches)	85%	very high
May Weather	18°C (65°F)	124 mm (4.9 inches)	81%	very high
June Weather	22°C (73°F)	134 mm (5.3 inches)	82%	very high
July Weather	25°C (77°F)	112 mm (4.4 inches)	81%	very high
August Weather	24°C (75°F)	99 mm (3.9 inches)	73%	very high
September Weather	21°C (70°F)	98 mm (3.9 inches)	73%	very high
October Weather	15°C (59°F)	111 mm (4.4 inches)	78%	high
November Weather	6°C (44°F)	91 mm (3.6 inches)	89%	moderate
December Weather	3°C (38°F)	109 mm (4.3 inches)	87%	moderate