September Weather in Marion, United States

Last updated: June 24, 2025

In Marion, United States, the average temperature in September hovers around 20°C (69°F), with a comfortable range that can drop to a minimum of 5°C (42°F) and peak at a warm 32°C (90°F). Expect about 152 mm (6.0 in) of precipitation over 11 days, adding a touch of freshness to the air, while the average humidity sits at a balmy 75%. Enjoy the unique climate that this month offers!

September Temperature in Marion

In September, in Marion, the average temperature is 20°C (69°F). The maximum can reach 32°C (90°F), while the minimum can be as low as 5°C (42°F). This makes Marion an ideal destination for travelers seeking a pleasant climate with a variety of outdoor activities.

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 20°C (69°F), with highs reaching up to 32°C (90°F) and lows dropping to around 5°C (42°F).

Data source: Temperature data for Marion generated using information from the Copernicus Climate Change Service.

September Precipitation in Marion

In Marion in September, the precipitation amount reaches 152 mm (6.0 in) over the course of 11 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 152 mm (6.0 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Marion

In Marion in September, humidity is 75%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel a bit muggy and requiring frequent hydration breaks to stay comfortable while exploring.

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 75%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (39°F)	108 mm (4.3 inches)	86%	moderate
February Weather	6°C (44°F)	134 mm (5.3 inches)	85%	high
March Weather	9°C (49°F)	114 mm (4.5 inches)	84%	very high
April Weather	13°C (56°F)	164 mm (6.4 inches)	82%	very high
May Weather	18°C (64°F)	162 mm (6.4 inches)	83%	extreme
June Weather	21°C (70°F)	119 mm (4.7 inches)	82%	extreme
July Weather	23°C (74°F)	122 mm (4.8 inches)	80%	extreme
August Weather	22°C (73°F)	144 mm (5.7 inches)	74%	very high
September Weather	20°C (69°F)	152 mm (6.0 inches)	75%	very high
October Weather	15°C (60°F)	184 mm (7.2 inches)	79%	very high
November Weather	8°C (46°F)	90 mm (3.5 inches)	87%	high
December Weather	5°C (42°F)	127 mm (5.0 inches)	87%	moderate