September Weather in Marion, United States

Last updated: June 24, 2025

In September, the average temperature in Marion, United States reaches a comfortable 25°C (77°F). However, temperatures can dip as low as 10°C (50°F) and soar up to 36°C (97°F). During this month, expect about 162 mm (6.4 in) of precipitation over 10 days, with an average humidity of 79%. Be prepared for a mix of conditions!

September Temperature in Marion

In September in Marion, the average temperature is 25°C (77°F). The maximum can reach 36°C (97°F), and the minimum can be as low as 10°C (50°F). This makes it an ideal time for traveling, as the warm days are perfect for outdoor activities while cooler evenings allow for comfortable exploration.

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 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 10°C (50°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 162 mm (6.4 in) over a span 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 162 mm (6.4 inches) of precipitation spread over approximately 10 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 79%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel feel slightly sluggish but pleasantly tropical.

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 79%, 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	9°C (48°F)	76 mm (3.0 inches)	85%	moderate
February Weather	12°C (53°F)	94 mm (3.7 inches)	82%	high
March Weather	14°C (57°F)	66 mm (2.6 inches)	81%	very high
April Weather	18°C (65°F)	94 mm (3.7 inches)	80%	very high
May Weather	23°C (74°F)	117 mm (4.6 inches)	81%	extreme
June Weather	25°C (78°F)	144 mm (5.7 inches)	81%	extreme
July Weather	27°C (81°F)	144 mm (5.7 inches)	81%	extreme
August Weather	27°C (80°F)	163 mm (6.4 inches)	80%	very high
September Weather	25°C (77°F)	162 mm (6.4 inches)	79%	very high
October Weather	20°C (69°F)	53 mm (2.1 inches)	80%	very high
November Weather	12°C (55°F)	81 mm (3.2 inches)	85%	high
December Weather	10°C (51°F)	132 mm (5.2 inches)	86%	moderate