September Weather in Jonesborough, United States

Last updated: June 24, 2025

In September, the average temperature in Jonesborough, United States is a pleasant 21°C (70°F). However, temperatures can vary significantly, dipping to a chilly 6°C (43°F) and soaring to a warm 33°C (92°F). Be prepared for some rain, as 85 mm (3.4 in) of precipitation can fall over 9 days. With an average humidity of 67%, it's advisable to stay hydrated and embrace the climate!

September Temperature in Jonesborough

In September in Jonesborough, the average temperature is 21°C (70°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (43°F). This weather makes Jonesborough an ideal destination for travelers seeking pleasant temperatures and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Jonesborough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jonesborough, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (43°F).

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

September Precipitation in Jonesborough

In Jonesborough in September, the total precipitation amount is 85 mm (3.4 in) recorded over a span of 9 days.

September Precipitation Trends in Jonesborough

The chart displays monthly precipitation patterns in Jonesborough, 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 Jonesborough, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Jonesborough

In Jonesborough 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 Jonesborough

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

In Jonesborough 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 Jonesborough.

Maximum UV Index Levels in Jonesborough for September

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

Data source: Jonesborough 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 Jonesborough Compares to Other Months

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

This table compares monthly weather conditions in Jonesborough, 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)	97 mm (3.8 inches)	88%	moderate
February Weather	7°C (44°F)	143 mm (5.6 inches)	88%	high
March Weather	9°C (49°F)	128 mm (5.1 inches)	87%	very high
April Weather	13°C (56°F)	133 mm (5.2 inches)	84%	very high
May Weather	18°C (65°F)	120 mm (4.7 inches)	84%	extreme
June Weather	22°C (71°F)	111 mm (4.4 inches)	83%	extreme
July Weather	24°C (75°F)	84 mm (3.3 inches)	79%	extreme
August Weather	23°C (73°F)	105 mm (4.1 inches)	66%	very high
September Weather	21°C (70°F)	85 mm (3.4 inches)	67%	very high
October Weather	16°C (60°F)	116 mm (4.5 inches)	76%	very high
November Weather	8°C (46°F)	81 mm (3.2 inches)	89%	moderate
December Weather	6°C (42°F)	130 mm (5.1 inches)	88%	moderate