September Weather in Greenville, United States

Last updated: June 24, 2025

In Greenville, United States, the average temperature in September hovers around 25°C (78°F), creating a comfortable climate for visitors and locals alike. However, temperatures can range from a cool 12°C (54°F) to a soaring 38°C (100°F). Expect about 107 mm (4.2 in) of precipitation spread over 11 days, with an average humidity level of 79% that enhances the tropical feel of the season. Enjoy the warmth, but don’t forget your umbrella!

September Temperature in Greenville

In September in Greenville, the average temperature is 25°C (78°F). The maximum can reach 38°C (100°F), while the minimum can dip as low as 12°C (54°F). This makes it an ideal time for travelers to enjoy warm days and cooler nights, perfect for outdoor activities and sightseeing.

September Weather in Greenville: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Greenville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greenville, 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 12°C (54°F).

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

September Precipitation in Greenville

In Greenville in September, the precipitation amount is 107 mm (4.2 in) spread over a period of 11 days.

September Precipitation Trends in Greenville

The chart displays monthly precipitation patterns in Greenville, 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 Greenville, September typically receives around 107 mm (4.2 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 Greenville

In Greenville in September humidity is 79%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less inviting and requiring frequent breaks to stay refreshed.

September Average Humidity in Greenville

This chart illustrates the average monthly humidity levels in Greenville, 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 Greenville 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 Greenville

In Greenville 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 Greenville.

Maximum UV Index Levels in Greenville for September

The chart shows the monthly maximum UV Index (UVI) for Greenville 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 Greenville typically reaches 10, which falls under the very high exposure category.

Data source: Greenville 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 Greenville Compares to Other Months

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

This table compares monthly weather conditions in Greenville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	106 mm (4.2 inches)	83%	moderate
February Weather	14°C (57°F)	119 mm (4.7 inches)	82%	very high
March Weather	16°C (62°F)	98 mm (3.9 inches)	79%	very high
April Weather	19°C (66°F)	121 mm (4.8 inches)	77%	extreme
May Weather	23°C (74°F)	119 mm (4.7 inches)	74%	extreme
June Weather	26°C (79°F)	136 mm (5.3 inches)	70%	extreme
July Weather	27°C (81°F)	116 mm (4.6 inches)	78%	extreme
August Weather	27°C (81°F)	125 mm (4.9 inches)	78%	extreme
September Weather	25°C (78°F)	107 mm (4.2 inches)	79%	very high
October Weather	21°C (71°F)	107 mm (4.2 inches)	74%	very high
November Weather	14°C (57°F)	69 mm (2.7 inches)	83%	high
December Weather	12°C (53°F)	133 mm (5.2 inches)	86%	moderate