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September Weather in Clayton, United States

Last updated: June 24, 2025

In September, the average temperature in Clayton, United States hovers around 20°C (68°F), offering a pleasant climate. However, be prepared for fluctuations, as temperatures can dip to a minimum of 6°C (43°F) and soar to a maximum of 31°C (88°F). Expect approximately 142 mm (5.6 in) of precipitation spread over 11 days, contributing to a 76% humidity level for a refreshing, albeit damp, atmosphere.

September Temperature in Clayton

In September in Clayton, the average temperature is 20°C (68°F). Maximum temperatures can reach 31°C (88°F), while minimums can drop as low as 6°C (43°F). It's an ideal time to visit for those who enjoy mild weather with a chance of warmer days.

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 20°C (68°F), with highs reaching up to 31°C (88°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec394549566469737268594742
Data source: Temperature data for Clayton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Clayton

In Clayton in September, the precipitation amount is 142 mm (5.6 in) over the course of 11 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 142 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec122196152149155131121160142173101156
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clayton

In Clayton in September, humidity is 76%. With an average temperature of 20°C (68°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration both exhilarating and slightly stifling, ideal for leisurely strolls but necessitating frequent breaks to hydrate and cool off.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec478111211111110864
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.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)122 mm (4.8 inches)86%moderate
February Weather7°C (45°F)196 mm (7.7 inches)86%high
March Weather10°C (49°F)152 mm (6.0 inches)86%very high
April Weather13°C (56°F)149 mm (5.9 inches)82%extreme
May Weather18°C (64°F)155 mm (6.1 inches)85%extreme
June Weather21°C (70°F)131 mm (5.2 inches)85%extreme
July Weather23°C (73°F)121 mm (4.8 inches)83%extreme
August Weather22°C (72°F)160 mm (6.3 inches)76%extreme
September Weather20°C (68°F)142 mm (5.6 inches)76%very high
October Weather15°C (60°F)172 mm (6.8 inches)80%very high
November Weather8°C (47°F)101 mm (4.0 inches)88%high
December Weather6°C (43°F)156 mm (6.2 inches)88%moderate

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