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September Weather in Clayton, United States

Last updated: June 24, 2025

In Clayton, United States, the average temperature in September hovers around 20°C (69°F), with potential extremes ranging from a chilly 0°C (33°F) to a sweltering 37°C (100°F). Visitors can expect 39 mm (1.5 in) of precipitation spread over approximately 5 days, contributing to an average humidity level of 80%. Whether you're basking in the warmth or seeking shelter from the occasional downpour, this month offers a unique blend of weather experiences!

September Temperature in Clayton

In September, in Clayton, the average temperature is 20°C (69°F). Maximums can reach 37°C (100°F), while minimums can drop as low as 0°C (33°F). Be prepared for a wide range of temperatures to ensure a comfortable travel experience.

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 (69°F), with highs reaching up to 37°C (100°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec363747536373767469554638
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 39 mm (1.5 in) spread over a duration of 5 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 39 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec15103537503445563935913
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 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%76%64%61%71%75%75%80%80%78%76%78%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468111113121110854
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 Weather2°C (36°F)15 mm (0.6 inches)73%moderate
February Weather3°C (37°F)10 mm (0.4 inches)76%high
March Weather8°C (47°F)34 mm (1.4 inches)64%very high
April Weather12°C (53°F)37 mm (1.5 inches)61%extreme
May Weather17°C (63°F)50 mm (2.0 inches)71%extreme
June Weather23°C (74°F)34 mm (1.3 inches)75%extreme
July Weather25°C (76°F)45 mm (1.8 inches)75%extreme
August Weather23°C (74°F)56 mm (2.2 inches)80%extreme
September Weather20°C (69°F)39 mm (1.5 inches)80%very high
October Weather13°C (55°F)35 mm (1.4 inches)78%very high
November Weather8°C (46°F)9 mm (0.4 inches)76%moderate
December Weather3°C (38°F)13 mm (0.5 inches)78%moderate

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