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September Weather in Greenville, United States

Last updated: June 24, 2025

The average temperature in Greenville, United States during September is a pleasant 18°C (65°F). However, visitors should be prepared for a range of conditions, as temperatures can dip to a minimum of 1°C (34°F) and peak at a sizzling 35°C (95°F). Expect 116 mm (4.5 in) of precipitation over about 10 days, contributing to an average humidity of 79%.

September Temperature in Greenville

In September in Greenville, the average temperature is 18°C (65°F). Maximums can reach 35°C (95°F), while minimums can be as low as 1°C (34°F). This diverse temperature range makes Greenville an ideal destination for travelers looking to experience both warm days and cooler nights.

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 18°C (65°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec252636465969747164523831
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 precipitation amount is 116 mm (4.5 in) over the course of 10 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 116 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6263639012812365741161296166
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 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
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 Weather-4°C (25°F)62 mm (2.4 inches)87%low
February Weather-4°C (26°F)63 mm (2.5 inches)87%moderate
March Weather2°C (36°F)63 mm (2.5 inches)86%moderate
April Weather8°C (46°F)90 mm (3.5 inches)87%very high
May Weather15°C (59°F)128 mm (5.0 inches)82%very high
June Weather21°C (69°F)123 mm (4.8 inches)81%very high
July Weather24°C (75°F)65 mm (2.6 inches)78%very high
August Weather22°C (72°F)74 mm (2.9 inches)79%very high
September Weather18°C (65°F)116 mm (4.5 inches)79%high
October Weather11°C (52°F)129 mm (5.1 inches)82%moderate
November Weather3°C (38°F)61 mm (2.4 inches)87%moderate
December Weather-1°C (31°F)66 mm (2.6 inches)86%low

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