September Weather in Rock Hill, United States

Last updated: June 24, 2025

In September, the average temperature in Rock Hill, United States is a comfortable 18°C (64°F), with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 31°C (88°F). Expect about 103 mm (4.0 in) of precipitation over 9 days, contributing to an average humidity of 68%. Enjoy the balanced climate as you explore!

September Temperature in Rock Hill

In September in Rock Hill, the average temperature is 18°C (64°F). Maximum temperatures can reach 31°C (88°F), while minimums can dip as low as 2°C (36°F). It's a great time to visit for travelers seeking mild weather with a chance to experience both warm and cool days.

September Weather in Rock Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rock Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rock Hill, September typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Rock Hill

In Rock Hill in September, the precipitation amount is 103 mm (4.0 in) over the course of 9 days.

September Precipitation Trends in Rock Hill

The chart displays monthly precipitation patterns in Rock Hill, 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 Rock Hill, September typically receives around 103 mm (4.0 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 Rock Hill

In Rock Hill in September, humidity is 68%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making for a slightly muggy experience that can leave you feeling sticky as you explore, so it’s best to stay hydrated and take frequent breaks in the shade.

September Average Humidity in Rock Hill

This chart illustrates the average monthly humidity levels in Rock Hill, 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 Rock Hill is approximately 68%, 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 Rock Hill

In Rock Hill 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 Rock Hill.

Maximum UV Index Levels in Rock Hill for September

The chart shows the monthly maximum UV Index (UVI) for Rock Hill 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 Rock Hill typically reaches 8, which falls under the very high exposure category.

Data source: Rock Hill 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 Rock Hill Compares to Other Months

Weather in Rock Hill varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rock Hill, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Rock Hill, 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 (27°F)	88 mm (3.5 inches)	84%	moderate
February Weather	-1°C (30°F)	115 mm (4.5 inches)	82%	moderate
March Weather	2°C (36°F)	101 mm (4.0 inches)	81%	high
April Weather	8°C (47°F)	143 mm (5.6 inches)	78%	very high
May Weather	14°C (58°F)	150 mm (5.9 inches)	69%	very high
June Weather	19°C (66°F)	124 mm (4.9 inches)	69%	very high
July Weather	22°C (72°F)	141 mm (5.6 inches)	62%	very high
August Weather	21°C (70°F)	136 mm (5.4 inches)	65%	very high
September Weather	18°C (64°F)	103 mm (4.0 inches)	68%	very high
October Weather	12°C (54°F)	164 mm (6.4 inches)	74%	high
November Weather	4°C (39°F)	110 mm (4.3 inches)	82%	moderate
December Weather	0°C (32°F)	126 mm (4.9 inches)	80%	low