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September Weather in Casselton, United States

Last updated: June 24, 2025

In September, the average temperature in Casselton, United States is a pleasant 16°C (61°F). However, be prepared for some temperature swings, as it can drop to a chilly -2°C (29°F) or reach a warm 33°C (91°F). Expect 68 mm (2.7 in) of precipitation over about 7 days, and enjoy the humid atmosphere with an average humidity of 77%.

September Temperature in Casselton

In September in Casselton, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop to as low as -2°C (29°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm and cool clothing.

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

The chart illustrates September temperature patterns in Casselton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casselton, September typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (91°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec111028405770736861442919
Data source: Temperature data for Casselton 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 Casselton

In Casselton in September, the precipitation amount is 68 mm (2.7 in) over the course of 7 days.

September Precipitation Trends in Casselton

The chart displays monthly precipitation patterns in Casselton, 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 Casselton, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec172027475798748768821739
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Casselton

In Casselton in September humidity is 77%. With an average temperature of 16°C (61°F), this humidity feels like a slight heaviness in the air, making every step feel a touch more effortful while traveling. The dampness clings to your skin, adding a layer of discomfort, yet the mild temperature invites you to explore the surroundings, blending the challenge of the humidity with an opportunity for a refreshing adventure.

September Average Humidity in Casselton

This chart illustrates the average monthly humidity levels in Casselton, 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 Casselton is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%92%85%81%75%79%77%78%77%79%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Casselton

In Casselton in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Casselton.

Maximum UV Index Levels in Casselton for September

The chart shows the monthly maximum UV Index (UVI) for Casselton 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 Casselton typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810987532
Data source: Casselton 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 Casselton Compares to Other Months

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

This table compares monthly weather conditions in Casselton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-12°C (12°F)17 mm (0.7 inches)90%low
February Weather-12°C (11°F)20 mm (0.8 inches)92%moderate
March Weather-2°C (28°F)26 mm (1.0 inches)85%moderate
April Weather4°C (40°F)47 mm (1.9 inches)81%high
May Weather14°C (57°F)57 mm (2.2 inches)75%very high
June Weather21°C (70°F)98 mm (3.9 inches)79%very high
July Weather23°C (73°F)74 mm (2.9 inches)76%very high
August Weather20°C (69°F)87 mm (3.4 inches)78%very high
September Weather16°C (61°F)68 mm (2.7 inches)77%high
October Weather7°C (45°F)82 mm (3.2 inches)79%moderate
November Weather-2°C (29°F)17 mm (0.7 inches)86%moderate
December Weather-7°C (19°F)39 mm (1.5 inches)86%low

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