September Weather in Marion, United States

Last updated: June 24, 2025

In September, the average temperature in Marion, United States hovers around 19°C (66°F). While you can expect cool lows of 3°C (38°F), temperatures can soar to a maximum of 33°C (92°F). Prepare for occasional showers, as 100 mm (3.9 in) of precipitation may grace the area over a span of 9 days. With an average humidity of 75%, it's a month of vibrant contrasts!

September Temperature in Marion

In September in Marion, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip as low as 3°C (38°F). This variety in weather makes Marion an ideal destination for travelers seeking both warm and cool experiences.

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 33°C (92°F) and lows dropping to around 3°C (38°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 is 100 mm (3.9 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 100 mm (3.9 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Marion

In Marion in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.

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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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	-7°C (20°F)	20 mm (0.8 inches)	80%	low
February Weather	-7°C (20°F)	22 mm (0.9 inches)	84%	moderate
March Weather	2°C (35°F)	64 mm (2.5 inches)	75%	moderate
April Weather	7°C (45°F)	77 mm (3.0 inches)	79%	very high
May Weather	15°C (59°F)	124 mm (4.9 inches)	74%	very high
June Weather	23°C (73°F)	82 mm (3.2 inches)	81%	extreme
July Weather	24°C (76°F)	85 mm (3.4 inches)	82%	very high
August Weather	22°C (72°F)	95 mm (3.8 inches)	80%	very high
September Weather	19°C (66°F)	100 mm (3.9 inches)	75%	very high
October Weather	9°C (48°F)	76 mm (3.0 inches)	77%	moderate
November Weather	2°C (35°F)	24 mm (0.9 inches)	85%	moderate
December Weather	-3°C (26°F)	38 mm (1.5 inches)	83%	low