September Weather in Appalachia, United States

Last updated: June 24, 2025

In Appalachia, United States, the average temperature in September hovers around 20°C (68°F). Expect a range where the minimum can dip to 6°C (42°F) and the maximum may soar to 32°C (91°F). This month brings with it 121 mm (4.8 in) of precipitation over about 11 days, contributing to an average humidity of 67%. Prepare for a mix of pleasant warmth and refreshing showers!

September Temperature in Appalachia

In September in Appalachia, the average temperature is 20°C (68°F). The maximum can reach 32°C (91°F), and the minimum can be as low as 6°C (42°F). This variation in temperature makes Appalachia an ideal destination for travelers seeking both warm and cooler experiences.

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

The chart illustrates September temperature patterns in Appalachia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Appalachia, September typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (91°F) and lows dropping to around 6°C (42°F).

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

September Precipitation in Appalachia

In Appalachia in September, the total precipitation amount is 121 mm (4.8 in), which occurs over the course of 11 days.

September Precipitation Trends in Appalachia

The chart displays monthly precipitation patterns in Appalachia, 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 Appalachia, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 11 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 Appalachia

In Appalachia in September humidity is 67%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making travel comfortable yet slightly sticky, as the air clings to your skin and invites you to enjoy the sights at a leisurely pace.

September Average Humidity in Appalachia

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

In Appalachia 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 Appalachia.

Maximum UV Index Levels in Appalachia for September

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

Data source: Appalachia 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 Appalachia Compares to Other Months

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

This table compares monthly weather conditions in Appalachia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	95 mm (3.7 inches)	88%	moderate
February Weather	5°C (41°F)	180 mm (7.1 inches)	88%	high
March Weather	8°C (47°F)	135 mm (5.3 inches)	87%	very high
April Weather	12°C (54°F)	160 mm (6.3 inches)	84%	very high
May Weather	18°C (64°F)	146 mm (5.8 inches)	84%	extreme
June Weather	21°C (69°F)	147 mm (5.8 inches)	83%	extreme
July Weather	23°C (73°F)	130 mm (5.1 inches)	79%	extreme
August Weather	22°C (72°F)	147 mm (5.8 inches)	66%	very high
September Weather	20°C (68°F)	121 mm (4.8 inches)	67%	very high
October Weather	15°C (58°F)	139 mm (5.5 inches)	76%	high
November Weather	7°C (44°F)	78 mm (3.1 inches)	89%	moderate
December Weather	4°C (40°F)	127 mm (5.0 inches)	88%	moderate