September Weather in Durham, United States

Last updated: June 24, 2025

In September, the average temperature in Durham, United States is a pleasant 24°C (76°F). However, be prepared for temperature fluctuations, as it can drop to a chilly 7°C (45°F) or soar to a scorching 43°C (109°F). The region experiences minimal precipitation, averaging only 8 mm (0.3 in) over about 1 day. With an average humidity of 44%, the climate remains relatively comfortable for most outdoor activities.

September Temperature in Durham

In September in Durham, the average temperature is 24°C (76°F), with maximums reaching 43°C (109°F) and minimums dropping as low as 7°C (45°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both hot and cool conditions.

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

The chart illustrates September temperature patterns in Durham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Durham, September typically has an average temperature of 24°C (76°F), with highs reaching up to 43°C (109°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Durham

In Durham in September, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

September Precipitation Trends in Durham

The chart displays monthly precipitation patterns in Durham, 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 Durham, September typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 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 Durham

In Durham in September, humidity is 44%. With an average temperature of 24°C (76°F), this humidity feels like a comfortable embrace, making travel enjoyable and the air refreshing as you explore the sights.

September Average Humidity in Durham

This chart illustrates the average monthly humidity levels in Durham, 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 Durham is approximately 44%, 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 Durham

In Durham 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 Durham.

Maximum UV Index Levels in Durham for September

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

Data source: Durham 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 Durham Compares to Other Months

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

This table compares monthly weather conditions in Durham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	183 mm (7.2 inches)	84%	moderate
February Weather	10°C (51°F)	199 mm (7.8 inches)	84%	moderate
March Weather	12°C (54°F)	156 mm (6.2 inches)	83%	high
April Weather	16°C (61°F)	79 mm (3.1 inches)	81%	very high
May Weather	20°C (69°F)	47 mm (1.9 inches)	74%	very high
June Weather	26°C (79°F)	8 mm (0.3 inches)	64%	extreme
July Weather	29°C (85°F)	1 mm (0.0 inches)	44%	extreme
August Weather	28°C (83°F)	1 mm (0.0 inches)	36%	very high
September Weather	24°C (76°F)	8 mm (0.3 inches)	44%	very high
October Weather	18°C (65°F)	53 mm (2.1 inches)	65%	high
November Weather	12°C (55°F)	96 mm (3.8 inches)	84%	moderate
December Weather	9°C (48°F)	140 mm (5.5 inches)	83%	moderate