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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 22°C (72°F). However, temperatures can vary significantly, with a minimum of 5°C (40°F) and a maximum reaching up to 35°C (95°F). Expect about 84 mm (3.3 in) of precipitation over 7 days, with the average humidity sitting comfortably at 71%.

September Temperature in Marion

In September in Marion, the average temperature is 22°C (72°F). The maximum can reach 35°C (95°F), while the minimum can be as low as 5°C (40°F). This diverse temperature range makes Marion an ideal destination for travelers seeking both warmth and cooler experiences throughout the day.

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 22°C (72°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec333447556577807772574538
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 total precipitation amount is 84 mm (3.3 in) distributed 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 84 mm (3.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec353281791709277135841042829
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 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 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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109743
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 Weather0°C (33°F)35 mm (1.4 inches)76%moderate
February Weather1°C (34°F)32 mm (1.2 inches)77%high
March Weather8°C (48°F)81 mm (3.2 inches)70%high
April Weather13°C (55°F)79 mm (3.1 inches)73%very high
May Weather19°C (66°F)170 mm (6.7 inches)82%very high
June Weather25°C (78°F)92 mm (3.6 inches)82%extreme
July Weather27°C (80°F)77 mm (3.0 inches)81%extreme
August Weather25°C (77°F)135 mm (5.3 inches)78%very high
September Weather22°C (72°F)84 mm (3.3 inches)71%very high
October Weather14°C (57°F)104 mm (4.1 inches)71%high
November Weather7°C (45°F)28 mm (1.1 inches)81%moderate
December Weather3°C (38°F)29 mm (1.1 inches)84%moderate

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