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September Weather in Marion, United States

Last updated: June 24, 2025

In September, the average temperature in Marion, United States hovers around 13°C (55°F), offering a comfortable climate for activities. However, expect a range in temperatures: minimums can drop to -3°C (26°F) while maximums can soar to 31°C (88°F). During this month, precipitation averages 40 mm (1.6 in) over 7 days, and humidity levels sit at a moderate 67%. Prepare accordingly to enjoy the diverse weather!

September Temperature in Marion

In September in Marion, the average temperature is 13°C (55°F). Maximums can reach 31°C (88°F) and minimums can be as low as -3°C (26°F). Be prepared for a wide range of temperatures when traveling to Marion during this month.

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

The chart illustrates September temperature patterns in Marion, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marion, September typically has an average temperature of 13°C (55°F), with highs reaching up to 31°C (88°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec242032395058676655403227
Data source: Temperature data for Marion 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 Marion

In Marion in September, the precipitation amount is 40 mm (1.6 in) over a span of 7 days.

September Precipitation Trends in Marion

The chart displays monthly precipitation patterns in Marion, 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 Marion, September typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec528253788058213140666870
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Marion

In Marion in September humidity is 67%. With an average temperature of 13°C (55°F), this humidity feels like a chilly embrace, making travel a bit uncomfortable as the cool air settles in.

September Average Humidity in Marion

This chart illustrates the average monthly humidity levels in Marion, 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 Marion is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%85%80%78%77%66%67%77%89%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Marion

In Marion 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 Marion.

Maximum UV Index Levels in Marion for September

The chart shows the monthly maximum UV Index (UVI) for Marion 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 Marion typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246799997532
Data source: Marion 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 Marion Compares to Other Months

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

This table compares monthly weather conditions in Marion, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)51 mm (2.0 inches)93%low
February Weather-7°C (20°F)82 mm (3.2 inches)92%moderate
March Weather0°C (32°F)53 mm (2.1 inches)89%high
April Weather4°C (39°F)78 mm (3.1 inches)85%high
May Weather10°C (50°F)80 mm (3.2 inches)80%very high
June Weather14°C (58°F)58 mm (2.3 inches)78%very high
July Weather19°C (67°F)21 mm (0.8 inches)77%very high
August Weather19°C (66°F)30 mm (1.2 inches)66%very high
September Weather13°C (55°F)40 mm (1.6 inches)67%high
October Weather5°C (41°F)66 mm (2.6 inches)77%moderate
November Weather0°C (32°F)68 mm (2.7 inches)89%moderate
December Weather-3°C (27°F)70 mm (2.7 inches)95%low

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