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September Weather in Greenville, United States

Last updated: June 24, 2025

In September, the average temperature in Greenville, United States hovers around 26°C (80°F), offering a pleasant climate. However, temperatures can fluctuate, with a minimum of 14°C (58°F) and soaring up to a maximum of 37°C (99°F). Expect some rain, as the region sees about 112 mm (4.4 in) of precipitation over 13 days, coupled with an average humidity of 83% that adds to the tropical ambiance.

September Temperature in Greenville

In September in Greenville, the average temperature is 26°C (80°F). Maximums can reach 37°C (99°F) and minimums can be as low as 14°C (58°F). This pleasant climate makes it an ideal destination for travelers seeking warm weather activities.

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 26°C (80°F), with highs reaching up to 37°C (99°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec546063687580818179736156
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 112 mm (4.4 in) over the course of 13 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 112 mm (4.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec70914887831721811561127753111
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 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings to your skin.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec589101111121110864
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 Weather12°C (54°F)70 mm (2.8 inches)85%moderate
February Weather15°C (60°F)91 mm (3.6 inches)82%very high
March Weather17°C (64°F)48 mm (1.9 inches)80%very high
April Weather20°C (68°F)87 mm (3.4 inches)76%very high
May Weather24°C (76°F)83 mm (3.3 inches)73%extreme
June Weather26°C (80°F)172 mm (6.8 inches)74%extreme
July Weather27°C (81°F)181 mm (7.1 inches)80%extreme
August Weather27°C (81°F)156 mm (6.1 inches)79%extreme
September Weather26°C (80°F)112 mm (4.4 inches)83%very high
October Weather23°C (74°F)77 mm (3.0 inches)77%very high
November Weather16°C (61°F)53 mm (2.1 inches)84%high
December Weather14°C (57°F)111 mm (4.4 inches)88%moderate

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