September Weather in Marion, United States

Last updated: June 24, 2025

In Marion, United States, the average temperature in September hovers around 25°C (78°F), with fluctuations ranging from a cool 10°C (51°F) to a sizzling 38°C (100°F). Expect a total precipitation of about 98 mm (3.8 in) over 9 days, accompanied by a comfortable average humidity of 74%. Enjoy the delightful climate while you explore!

September Temperature in Marion

In September in Marion, the average temperature is 25°C (78°F). The maximum can reach 38°C (100°F), and the minimum can be as low as 10°C (51°F). It's a great time to explore outdoor activities while enjoying the warm weather, but be prepared for both the heat and cooler 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 25°C (78°F), with highs reaching up to 38°C (100°F) and lows dropping to around 10°C (51°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 98 mm (3.8 in) occurring over the course of 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 98 mm (3.8 inches) of precipitation spread over approximately 9 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 74%. With an average temperature of 25°C (78°F), this humidity feels like you're enveloped in a warm, thick blanket, making outdoor activities feel more strenuous and necessitating frequent breaks and hydration for comfortable travel.

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 74%, 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 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.

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)	104 mm (4.1 inches)	85%	moderate
February Weather	12°C (54°F)	148 mm (5.8 inches)	84%	high
March Weather	16°C (60°F)	117 mm (4.6 inches)	82%	very high
April Weather	18°C (65°F)	133 mm (5.3 inches)	82%	extreme
May Weather	23°C (74°F)	114 mm (4.5 inches)	82%	extreme
June Weather	26°C (79°F)	167 mm (6.6 inches)	79%	extreme
July Weather	27°C (81°F)	117 mm (4.6 inches)	82%	extreme
August Weather	27°C (81°F)	128 mm (5.1 inches)	77%	extreme
September Weather	25°C (78°F)	98 mm (3.8 inches)	74%	very high
October Weather	20°C (69°F)	107 mm (4.2 inches)	73%	very high
November Weather	13°C (55°F)	68 mm (2.7 inches)	85%	high
December Weather	11°C (52°F)	123 mm (4.8 inches)	88%	moderate