September Weather in Greeneville, United States

Last updated: June 24, 2025

In September, the average temperature in Greeneville, United States hovers around 21°C (70°F), making it a pleasant time to visit. Expect a temperature range that dips to a cool 6°C (43°F) at night and could rise as high as 34°C (93°F) during the day. With an average precipitation of 90 mm (3.6 in) spread over 9 days, it's wise to pack an umbrella. Additionally, be prepared for a comfortable humidity level at 67%.

September Temperature in Greeneville

In September in Greeneville, the average temperature is 21°C (70°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 6°C (43°F). This makes it a great time to explore the area, as you can enjoy warm days and cool evenings.

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

The chart illustrates September temperature patterns in Greeneville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greeneville, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).

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

September Precipitation in Greeneville

In Greeneville in September, the precipitation amount is 90 mm (3.6 in) spread over the course of 9 days.

September Precipitation Trends in Greeneville

The chart displays monthly precipitation patterns in Greeneville, 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 Greeneville, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 9 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 Greeneville

In Greeneville in September humidity is 67%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making travel a bit stifling but still enjoyable if you're prepared with light clothing and plenty of water.

September Average Humidity in Greeneville

This chart illustrates the average monthly humidity levels in Greeneville, 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 Greeneville is approximately 67%, 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 Greeneville

In Greeneville 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 Greeneville.

Maximum UV Index Levels in Greeneville for September

The chart shows the monthly maximum UV Index (UVI) for Greeneville 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 Greeneville typically reaches 9, which falls under the very high exposure category.

Data source: Greeneville 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 Greeneville Compares to Other Months

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

This table compares monthly weather conditions in Greeneville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	93 mm (3.6 inches)	88%	moderate
February Weather	7°C (45°F)	148 mm (5.8 inches)	88%	high
March Weather	10°C (50°F)	130 mm (5.1 inches)	87%	very high
April Weather	14°C (57°F)	137 mm (5.4 inches)	84%	very high
May Weather	19°C (66°F)	129 mm (5.1 inches)	84%	extreme
June Weather	22°C (72°F)	115 mm (4.5 inches)	83%	extreme
July Weather	24°C (76°F)	93 mm (3.7 inches)	79%	extreme
August Weather	23°C (74°F)	113 mm (4.4 inches)	66%	very high
September Weather	21°C (70°F)	90 mm (3.6 inches)	67%	very high
October Weather	16°C (61°F)	120 mm (4.7 inches)	76%	high
November Weather	8°C (46°F)	79 mm (3.1 inches)	89%	moderate
December Weather	6°C (42°F)	127 mm (5.0 inches)	88%	moderate