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September Weather in Marion, United States

Last updated: June 24, 2025

In September, the average temperature in Marion, United States is a comfortable 26°C (79°F). However, temperatures can vary significantly, ranging from a cool 11°C (53°F) to a sizzling 40°C (104°F). Expect about 72 mm (2.8 in) of precipitation over 8 days, accompanied by an average humidity of 73%. Whether you’re enjoying the warmth or seeking refuge from the rain, prepare for a diverse climate!

September Temperature in Marion

In September in Marion, the average temperature is 26°C (79°F). Maximums can reach 40°C (104°F) and minimums can be as low as 11°C (53°F). Be prepared for a wide range of temperatures while exploring Marion during this time.

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 26°C (79°F), with highs reaching up to 40°C (104°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec475160647480838279675551
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 72 mm (2.8 in) over the course of 8 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 72 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec120178171188141135991017214675124
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 73%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace, making travel slightly uncomfortable as you navigate through the heat with a constant sheen of sweat on your skin.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111211119864
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 Weather8°C (48°F)119 mm (4.7 inches)84%moderate
February Weather10°C (51°F)178 mm (7.0 inches)83%high
March Weather16°C (61°F)171 mm (6.7 inches)80%very high
April Weather18°C (65°F)188 mm (7.4 inches)82%very high
May Weather23°C (74°F)141 mm (5.6 inches)83%extreme
June Weather27°C (81°F)135 mm (5.3 inches)80%extreme
July Weather28°C (83°F)99 mm (3.9 inches)80%extreme
August Weather28°C (83°F)101 mm (4.0 inches)75%extreme
September Weather26°C (79°F)72 mm (2.8 inches)73%very high
October Weather20°C (68°F)146 mm (5.8 inches)76%very high
November Weather13°C (55°F)75 mm (3.0 inches)84%high
December Weather11°C (52°F)124 mm (4.9 inches)88%moderate

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