September Weather in Clayton, United States

Last updated: June 24, 2025

In September, the average temperature in Clayton, United States hovers around 23°C (74°F), making it a pleasant time to visit. However, be prepared for temperature variations, as it can drop to a minimum of 9°C (48°F) and reach up to 35°C (96°F). During this month, expect 139 mm (5.5 in) of precipitation over about 10 days, with humidity levels averaging a comfortable 79%. Whether you're exploring the outdoors or indulging in local culture, September offers a delightful experience in Clayton!

September Temperature in Clayton

In September in Clayton, the average temperature is 23°C (74°F). Maximums can reach 35°C (96°F), while minimums can drop as low as 9°C (48°F). Overall, this month offers a warm climate, making it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Clayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clayton, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Clayton

In Clayton, in September, the total precipitation amount is 139 mm (5.5 in) accumulated over 10 days.

September Precipitation Trends in Clayton

The chart displays monthly precipitation patterns in Clayton, 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 Clayton, September typically receives around 139 mm (5.5 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 Clayton

In Clayton in September, humidity is 79%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities a bit less comfortable, urging travelers to seek shade and hydration throughout the day.

September Average Humidity in Clayton

This chart illustrates the average monthly humidity levels in Clayton, 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 Clayton is approximately 79%, 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 Clayton

In Clayton 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 Clayton.

Maximum UV Index Levels in Clayton for September

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

Data source: Clayton 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 Clayton Compares to Other Months

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

This table compares monthly weather conditions in Clayton, 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 (43°F)	93 mm (3.7 inches)	85%	moderate
February Weather	9°C (49°F)	102 mm (4.0 inches)	82%	high
March Weather	11°C (53°F)	79 mm (3.1 inches)	81%	very high
April Weather	17°C (62°F)	113 mm (4.5 inches)	80%	very high
May Weather	22°C (71°F)	119 mm (4.7 inches)	81%	very high
June Weather	25°C (76°F)	137 mm (5.4 inches)	81%	extreme
July Weather	27°C (81°F)	123 mm (4.8 inches)	81%	extreme
August Weather	26°C (79°F)	156 mm (6.2 inches)	80%	very high
September Weather	23°C (74°F)	139 mm (5.5 inches)	79%	very high
October Weather	18°C (65°F)	82 mm (3.2 inches)	80%	very high
November Weather	11°C (52°F)	84 mm (3.3 inches)	85%	moderate
December Weather	8°C (47°F)	106 mm (4.2 inches)	86%	moderate