September Weather in Chillicothe, United States

Last updated: June 24, 2025

In Chillicothe, United States, the average temperature in September hovers around 25°C (77°F). While you may enjoy warm days, be prepared for cooler nights with minimum temperatures dropping to 8°C (47°F) and the occasional swelter reaching 39°C (102°F). Expect an average precipitation of 84 mm (3.3 in) over 6 days, accompanied by a comfortable average humidity of 64%. Whether you're planning outdoor activities or cozy indoor moments, this season in Chillicothe has something for everyone!

September Temperature in Chillicothe

In September in Chillicothe, the average temperature is 25°C (77°F). Maximums can reach 39°C (102°F), while minimums can dip as low as 8°C (47°F). Be prepared for warm days and cool evenings when traveling during this time.

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 25°C (77°F), with highs reaching up to 39°C (102°F) and lows dropping to around 8°C (47°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 precipitation amount is 84 mm (3.3 in) accumulated over the course of 6 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 84 mm (3.3 inches) of precipitation spread over approximately 6 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 64%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor excursions feel a bit heavier, yet still inviting for travelers seeking a vibrant atmosphere.

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 64%, 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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, 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	6°C (42°F)	31 mm (1.2 inches)	76%	moderate
February Weather	7°C (44°F)	24 mm (0.9 inches)	76%	high
March Weather	14°C (57°F)	58 mm (2.3 inches)	70%	very high
April Weather	17°C (63°F)	93 mm (3.7 inches)	72%	very high
May Weather	23°C (73°F)	110 mm (4.3 inches)	82%	extreme
June Weather	27°C (82°F)	62 mm (2.5 inches)	82%	extreme
July Weather	30°C (86°F)	23 mm (0.9 inches)	80%	extreme
August Weather	29°C (84°F)	40 mm (1.6 inches)	72%	extreme
September Weather	25°C (77°F)	84 mm (3.3 inches)	64%	very high
October Weather	18°C (64°F)	69 mm (2.7 inches)	71%	very high
November Weather	12°C (53°F)	22 mm (0.9 inches)	81%	moderate
December Weather	8°C (47°F)	25 mm (1.0 inches)	84%	moderate