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September Weather in Clarkson, United States

Last updated: June 24, 2025

In September, the average temperature in Clarkson, United States hovers around 22°C (72°F), making it a comfortable time to explore. However, be prepared for fluctuations, with temperatures dipping as low as 8°C (47°F) and soaring up to 36°C (98°F). Expect some rain, too, with an average precipitation of 124 mm (4.9 in) spread over 8 days, and keep in mind that humidity levels sit at a moderate 71%.

September Temperature in Clarkson

In September in Clarkson, the average temperature is 22°C (72°F). Maximums can reach 36°C (98°F), and minimums can drop as low as 8°C (47°F). Be prepared for a range of temperatures and pack accordingly for your trip!

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

The chart illustrates September temperature patterns in Clarkson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clarkson, September typically has an average temperature of 22°C (72°F), with highs reaching up to 36°C (98°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec374149576875797772614642
Data source: Temperature data for Clarkson 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 Clarkson

In Clarkson in September, the precipitation amount is 124 mm (4.9 in) over a span of 8 days.

September Precipitation Trends in Clarkson

The chart displays monthly precipitation patterns in Clarkson, 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 Clarkson, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10016113914613013312111212411494117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clarkson

In Clarkson in September humidity is 71%. With an average temperature of 22°C (72°F), this humidity feels like the air is thick and slightly stifling, making outdoor activities require frequent breaks to stay hydrated and cool.

September Average Humidity in Clarkson

This chart illustrates the average monthly humidity levels in Clarkson, 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 Clarkson is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%82%83%83%80%74%71%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clarkson

In Clarkson 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 Clarkson.

Maximum UV Index Levels in Clarkson for September

The chart shows the monthly maximum UV Index (UVI) for Clarkson 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 Clarkson typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101110109753
Data source: Clarkson 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 Clarkson Compares to Other Months

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

This table compares monthly weather conditions in Clarkson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)100 mm (3.9 inches)87%moderate
February Weather5°C (42°F)161 mm (6.4 inches)86%high
March Weather10°C (50°F)139 mm (5.5 inches)86%high
April Weather14°C (57°F)146 mm (5.8 inches)82%very high
May Weather20°C (69°F)130 mm (5.1 inches)82%very high
June Weather24°C (76°F)133 mm (5.2 inches)83%extreme
July Weather26°C (80°F)121 mm (4.7 inches)80%very high
August Weather25°C (77°F)111 mm (4.4 inches)74%very high
September Weather22°C (72°F)124 mm (4.9 inches)71%very high
October Weather16°C (61°F)114 mm (4.5 inches)78%high
November Weather8°C (46°F)94 mm (3.7 inches)88%moderate
December Weather6°C (42°F)117 mm (4.6 inches)88%moderate

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