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September Weather in Marion, United States

Last updated: June 24, 2025

In Marion, United States, the average temperature in September hovers around 26°C (78°F). Temperatures can range from a cool 12°C (53°F) to a scorching 37°C (99°F). Be prepared for some rain, as the area receives an average precipitation of 84 mm (3.3 in) spread over 9 days. Moreover, the average humidity sits at a comfortable 73%, making for a pleasantly warm atmosphere.

September Temperature in Marion

In September in Marion, the average temperature is 26°C (78°F). The maximum can reach 37°C (99°F), while the minimum can drop to as low as 12°C (53°F). This pleasant range of temperatures makes Marion an ideal destination for travelers seeking both warmth and comfortable evenings.

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 (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec485460657479818178695551
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 84 mm (3.3 in) spread over 9 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 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1081481391481201621151298413083141
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 (78°F), this humidity feels like a warm embrace, making traveling a bit sticky but also inviting, as the air wraps around you, intensifying the heat and creating a tropical atmosphere.

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.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
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 Weather9°C (49°F)108 mm (4.3 inches)85%moderate
February Weather12°C (55°F)148 mm (5.8 inches)84%high
March Weather16°C (61°F)139 mm (5.5 inches)82%very high
April Weather18°C (65°F)148 mm (5.8 inches)82%very high
May Weather23°C (74°F)120 mm (4.7 inches)81%extreme
June Weather26°C (79°F)162 mm (6.4 inches)77%extreme
July Weather27°C (82°F)115 mm (4.5 inches)77%extreme
August Weather27°C (81°F)129 mm (5.1 inches)72%extreme
September Weather26°C (78°F)84 mm (3.3 inches)73%very high
October Weather21°C (70°F)130 mm (5.1 inches)73%very high
November Weather13°C (55°F)83 mm (3.3 inches)85%high
December Weather11°C (52°F)141 mm (5.6 inches)88%moderate

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