September Weather in Chesterfield, United States

Last updated: June 24, 2025

In September, the average temperature in Chesterfield, United States is a comfortable 24°C (76°F). However, be prepared for a range of temperatures: lows can drop to 9°C (49°F), while highs may reach 35°C (96°F). Rainfall is also a factor, with an average precipitation of 156 mm (6.2 in) spread over 10 days. Humidity hovers around a comfortable 75%, creating a warm and inviting atmosphere.

September Temperature in Chesterfield

In September in Chesterfield, the average temperature is 24°C (76°F). The maximum can reach 35°C (96°F), while the minimum can be as low as 9°C (49°F). This makes Chesterfield a great destination for travelers seeking warm weather, but it's wise to pack layers for cooler evenings.

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

The chart illustrates September temperature patterns in Chesterfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chesterfield, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (49°F).

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

September Precipitation in Chesterfield

In Chesterfield in September, the total precipitation amount is 156 mm (6.2 in) over the course of 10 days.

September Precipitation Trends in Chesterfield

The chart displays monthly precipitation patterns in Chesterfield, 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 Chesterfield, September typically receives around 156 mm (6.2 inches) of precipitation spread over approximately 10 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 Chesterfield

In Chesterfield in September, humidity is 75%. With an average temperature of 24°C (76°F), this humidity feels like a warm embrace, making travel somewhat stifling but also richly invigorating, as the air seems to wrap around you, heightening the experience of the local sights and sounds.

September Average Humidity in Chesterfield

This chart illustrates the average monthly humidity levels in Chesterfield, 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 Chesterfield is approximately 75%, 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 Chesterfield

In Chesterfield in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Chesterfield.

Maximum UV Index Levels in Chesterfield for September

The chart shows the monthly maximum UV Index (UVI) for Chesterfield 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 Chesterfield typically reaches 9, which falls under the very high exposure category.

Data source: Chesterfield 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 Chesterfield Compares to Other Months

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

This table compares monthly weather conditions in Chesterfield, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	92 mm (3.6 inches)	86%	moderate
February Weather	11°C (52°F)	105 mm (4.1 inches)	85%	high
March Weather	13°C (56°F)	77 mm (3.0 inches)	84%	very high
April Weather	18°C (64°F)	100 mm (3.9 inches)	82%	very high
May Weather	22°C (73°F)	112 mm (4.4 inches)	83%	extreme
June Weather	25°C (78°F)	133 mm (5.2 inches)	82%	extreme
July Weather	27°C (81°F)	119 mm (4.7 inches)	80%	extreme
August Weather	26°C (80°F)	130 mm (5.1 inches)	74%	very high
September Weather	24°C (76°F)	156 mm (6.2 inches)	75%	very high
October Weather	19°C (67°F)	68 mm (2.7 inches)	79%	very high
November Weather	12°C (53°F)	71 mm (2.8 inches)	87%	high
December Weather	9°C (49°F)	125 mm (4.9 inches)	87%	moderate