nomadseason

September Weather in Clarkson, United States

Last updated: June 24, 2025

In Clarkson, United States, the average temperature in September is a pleasant 20°C (68°F). However, be prepared for a range, as temperatures can dip as low as 4°C (40°F) and soar to a sizzling 35°C (95°F). This month also brings about 70 mm (2.7 in) of precipitation spread over 9 days, contributing to an average humidity of 75%. Whether you're enjoying the warmth or bracing for the rain, be ready for a dynamic weather experience!

September Temperature in Clarkson

In September in Clarkson, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (40°F). This makes Clarkson an ideal destination for travelers, offering pleasant weather for a variety of outdoor activities.

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 20°C (68°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec242439486175777368513930
Data source: Temperature data for Clarkson generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 70 mm (2.7 in) over the course of 9 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 70 mm (2.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec282587591471066710170872743
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Clarkson

In Clarkson in September, humidity is 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
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 Weather-4°C (24°F)28 mm (1.1 inches)76%moderate
February Weather-4°C (24°F)25 mm (1.0 inches)80%moderate
March Weather4°C (39°F)87 mm (3.4 inches)73%high
April Weather9°C (49°F)59 mm (2.3 inches)74%very high
May Weather16°C (61°F)147 mm (5.8 inches)78%very high
June Weather24°C (75°F)106 mm (4.2 inches)82%very high
July Weather25°C (77°F)67 mm (2.6 inches)83%very high
August Weather23°C (74°F)101 mm (4.0 inches)80%very high
September Weather20°C (68°F)70 mm (2.7 inches)75%very high
October Weather11°C (51°F)87 mm (3.4 inches)75%high
November Weather4°C (39°F)27 mm (1.1 inches)82%moderate
December Weather-1°C (30°F)43 mm (1.7 inches)83%low

Compare Clarkson's Climate with Cities Worldwide