September Weather in Raleigh, United States

Last updated: June 24, 2025

In September, the average temperature in Raleigh, United States reaches a warm 26°C (78°F), with exciting variations: it can dip to a cool 11°C (52°F) or soar to a sizzling 38°C (101°F). Expect some rain, as the area receives about 95 mm (3.7 in) of precipitation over 9 days, and be prepared for the high humidity of around 80%—perfect for embracing the tropical vibe!

September Temperature in Raleigh

In September in Raleigh, the average temperature is 26°C (78°F). Maximum can reach 38°C (101°F) and minimum can be as low as 11°C (52°F). Travelers should prepare for a warm climate with potential for cool evenings, making it an ideal time for both outdoor adventures and comfortable evening strolls.

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

The chart illustrates September temperature patterns in Raleigh, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Raleigh, September typically has an average temperature of 26°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Raleigh

In Raleigh in September, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in Raleigh

The chart displays monthly precipitation patterns in Raleigh, 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 Raleigh, September typically receives around 95 mm (3.7 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 Raleigh

In Raleigh in September, humidity is 80%. With an average temperature of 26°C (78°F), this humidity feels like a warm blanket enveloping you, making travel a bit sticky yet vibrant, as you experience the lively atmosphere infused with the scent of tropical blooms and the soothing presence of nearby water.

September Average Humidity in Raleigh

This chart illustrates the average monthly humidity levels in Raleigh, 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 Raleigh is approximately 80%, 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 Raleigh

In Raleigh 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 Raleigh.

Maximum UV Index Levels in Raleigh for September

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

Data source: Raleigh 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 Raleigh Compares to Other Months

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

This table compares monthly weather conditions in Raleigh, 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)	110 mm (4.3 inches)	82%	moderate
February Weather	12°C (55°F)	142 mm (5.6 inches)	80%	high
March Weather	16°C (61°F)	128 mm (5.0 inches)	80%	very high
April Weather	18°C (65°F)	142 mm (5.6 inches)	78%	extreme
May Weather	23°C (74°F)	145 mm (5.7 inches)	73%	extreme
June Weather	26°C (79°F)	166 mm (6.5 inches)	71%	extreme
July Weather	27°C (81°F)	129 mm (5.1 inches)	79%	extreme
August Weather	27°C (81°F)	143 mm (5.6 inches)	78%	extreme
September Weather	26°C (78°F)	95 mm (3.7 inches)	80%	very high
October Weather	21°C (70°F)	94 mm (3.7 inches)	76%	very high
November Weather	13°C (56°F)	73 mm (2.9 inches)	83%	high
December Weather	11°C (52°F)	130 mm (5.1 inches)	87%	moderate