September Weather in Clayton, United States

Last updated: June 24, 2025

In September, the average temperature in Clayton, United States reaches a pleasant 25°C (78°F). However, prepare for variations, as lows can drop to 12°C (54°F) while highs may soar to 37°C (98°F). Expect 112 mm (4.4 in) of precipitation spread over about 10 days, accompanied by an average humidity level of 79%.

September Temperature in Clayton

In September in Clayton, the average temperature is 25°C (78°F). Maximums can reach 37°C (98°F) and minimums can be as low as 12°C (54°F). This range makes it a perfect time to explore and enjoy outdoor activities in Clayton.

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 25°C (78°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (54°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 112 mm (4.4 in) over the course of 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 112 mm (4.4 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 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less inviting and requiring frequent breaks to stay refreshed.

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 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 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 10, 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	10°C (50°F)	108 mm (4.2 inches)	83%	moderate
February Weather	13°C (56°F)	116 mm (4.6 inches)	82%	high
March Weather	16°C (61°F)	94 mm (3.7 inches)	79%	very high
April Weather	19°C (66°F)	125 mm (4.9 inches)	77%	very high
May Weather	23°C (74°F)	113 mm (4.4 inches)	74%	extreme
June Weather	26°C (79°F)	120 mm (4.7 inches)	70%	extreme
July Weather	27°C (81°F)	107 mm (4.2 inches)	78%	extreme
August Weather	27°C (81°F)	123 mm (4.8 inches)	78%	extreme
September Weather	25°C (78°F)	112 mm (4.4 inches)	79%	very high
October Weather	21°C (70°F)	119 mm (4.7 inches)	74%	very high
November Weather	14°C (57°F)	65 mm (2.5 inches)	83%	high
December Weather	11°C (53°F)	132 mm (5.2 inches)	86%	moderate