September Weather in Clay, United States

Last updated: June 24, 2025

In September, the average temperature in Clay, United States hovers around 20°C (68°F). Expect a delightful range, with minimums dipping to 5°C (41°F) and maximums rising to 33°C (91°F). However, prepare for some wet days as the area sees about 107 mm (4.2 in) of precipitation over 9 days, and enjoy a cozy average humidity of 73%.

September Temperature in Clay

In September in Clay, the average temperature is 20°C (68°F). Maximums can reach 33°C (91°F) and minimums can be as low as 5°C (41°F). Be prepared for a range of temperatures and pack accordingly to enjoy your travels!

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

The chart illustrates September temperature patterns in Clay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clay, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Clay

In Clay in September, the precipitation amount is 107 mm (4.2 in), occurring over a span of 9 days.

September Precipitation Trends in Clay

The chart displays monthly precipitation patterns in Clay, 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 Clay, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 9 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 Clay

In Clay in September, humidity is 73%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities somewhat sticky, yet the atmosphere remains pleasant for leisurely strolls and sightseeing.

September Average Humidity in Clay

This chart illustrates the average monthly humidity levels in Clay, 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 Clay 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 Clay

In Clay 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 Clay.

Maximum UV Index Levels in Clay for September

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

Data source: Clay 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 Clay Compares to Other Months

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

This table compares monthly weather conditions in Clay, 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 (35°F)	107 mm (4.2 inches)	88%	moderate
February Weather	4°C (40°F)	161 mm (6.3 inches)	88%	moderate
March Weather	7°C (46°F)	126 mm (5.0 inches)	88%	high
April Weather	12°C (54°F)	149 mm (5.9 inches)	86%	very high
May Weather	18°C (64°F)	171 mm (6.7 inches)	82%	very high
June Weather	21°C (70°F)	163 mm (6.4 inches)	84%	very high
July Weather	23°C (74°F)	137 mm (5.4 inches)	82%	very high
August Weather	22°C (72°F)	130 mm (5.1 inches)	73%	very high
September Weather	20°C (68°F)	107 mm (4.2 inches)	73%	very high
October Weather	15°C (59°F)	126 mm (5.0 inches)	81%	high
November Weather	7°C (45°F)	87 mm (3.4 inches)	89%	moderate
December Weather	4°C (40°F)	131 mm (5.1 inches)	86%	moderate