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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 pleasant 19°C (66°F), with temperatures ranging from a cool 2°C (37°F) to a warm 29°C (85°F). Expect some rain, as the region experiences approximately 102 mm (4.0 in) of precipitation over 10 days. Additionally, the average humidity level hovers around a comfortable 68%, creating a moderately tropical atmosphere.

September Temperature in Marion

In September in Marion, the average temperature is 19°C (66°F). Maximums can reach 29°C (85°F) and minimums can be as low as 2°C (37°F). This range makes it a great time to explore the outdoors, so pack accordingly for both warm and cooler conditions.

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 19°C (66°F), with highs reaching up to 29°C (85°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec344045526167716965564239
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 102 mm (4.0 in) falling over the course of 10 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 102 mm (4.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec85126112131119111789610211669103
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 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468111111111010853
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 Weather1°C (35°F)85 mm (3.4 inches)87%moderate
February Weather4°C (40°F)126 mm (5.0 inches)87%high
March Weather7°C (45°F)112 mm (4.4 inches)86%very high
April Weather11°C (52°F)131 mm (5.2 inches)84%extreme
May Weather16°C (61°F)119 mm (4.7 inches)83%extreme
June Weather19°C (67°F)111 mm (4.4 inches)83%extreme
July Weather22°C (71°F)78 mm (3.1 inches)79%extreme
August Weather21°C (70°F)96 mm (3.8 inches)66%very high
September Weather19°C (66°F)102 mm (4.0 inches)68%very high
October Weather13°C (56°F)116 mm (4.6 inches)78%very high
November Weather6°C (43°F)69 mm (2.7 inches)89%moderate
December Weather4°C (39°F)103 mm (4.1 inches)86%moderate

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