September Weather in Durham, United States

Last updated: June 24, 2025

In September, the average temperature in Durham, United States hovers around 18°C (65°F). Daytime highs can reach up to 32°C (91°F), while nighttime lows may drop to 3°C (38°F). Expect 73 mm (2.9 in) of precipitation during approximately 7 days, contributing to an average humidity of 71%. Be prepared for a mix of warmth and occasional rain as you explore this vibrant destination!

September Temperature in Durham

In September in Durham, the average temperature is 18°C (65°F). Maximums can reach 32°C (91°F) and minimums can be as low as 3°C (38°F). It's a great time for travelers to enjoy a mix of warm days and cooler nights, making it ideal for outdoor activities and sightseeing.

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 18°C (65°F), with highs reaching up to 32°C (91°F) and lows dropping to around 3°C (38°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 73 mm (2.9 in) during a span of 7 days.

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 73 mm (2.9 inches) of precipitation spread over approximately 7 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 Durham

In Durham in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

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 71%, 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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the 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	-3°C (27°F)	75 mm (3.0 inches)	86%	moderate
February Weather	-2°C (29°F)	91 mm (3.6 inches)	84%	moderate
March Weather	2°C (35°F)	84 mm (3.3 inches)	82%	moderate
April Weather	8°C (46°F)	133 mm (5.2 inches)	80%	very high
May Weather	14°C (57°F)	76 mm (3.0 inches)	72%	very high
June Weather	20°C (67°F)	91 mm (3.6 inches)	72%	very high
July Weather	22°C (72°F)	138 mm (5.4 inches)	67%	very high
August Weather	22°C (72°F)	81 mm (3.2 inches)	66%	very high
September Weather	18°C (65°F)	73 mm (2.9 inches)	71%	high
October Weather	12°C (54°F)	129 mm (5.1 inches)	78%	moderate
November Weather	4°C (40°F)	108 mm (4.3 inches)	84%	moderate
December Weather	-1°C (31°F)	128 mm (5.0 inches)	81%	low