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September Weather in Greenville, United States

Last updated: June 24, 2025

In Greenville, United States, the average temperature in September is a pleasant 20°C (68°F). However, be prepared for variability, as temperatures can dip as low as 2°C (37°F) and soar to a maximum of 33°C (92°F). Expect a fair amount of rain, with 101 mm (4.0 in) of precipitation spread over about 9 days. Overall, the average humidity rests comfortably at 75%, adding to the region's unique climate experience.

September Temperature in Greenville

In September in Greenville, the average temperature is 20°C (68°F). The maximum can reach 33°C (92°F), while the minimum can drop to as low as 2°C (37°F). This variability makes it advisable to pack layers and prepare for both warm and cool conditions during your travels.

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 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec343945546370757368584338
Data source: Temperature data for Greenville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Greenville

In Greenville in September, the total precipitation amount is 101 mm (4.0 in), occurring over a span of 9 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 101 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec651017311412590591081021087689
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Greenville

In Greenville in September, humidity is 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3689111111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)65 mm (2.5 inches)84%moderate
February Weather4°C (40°F)101 mm (4.0 inches)84%high
March Weather7°C (45°F)73 mm (2.9 inches)84%very high
April Weather12°C (54°F)114 mm (4.5 inches)82%very high
May Weather17°C (63°F)125 mm (4.9 inches)82%extreme
June Weather21°C (70°F)90 mm (3.5 inches)83%extreme
July Weather24°C (76°F)59 mm (2.3 inches)79%extreme
August Weather23°C (73°F)108 mm (4.2 inches)77%very high
September Weather20°C (68°F)101 mm (4.0 inches)75%very high
October Weather14°C (58°F)108 mm (4.2 inches)81%high
November Weather6°C (43°F)76 mm (3.0 inches)87%moderate
December Weather4°C (39°F)89 mm (3.5 inches)85%moderate

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