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September Weather in Chapel Hill, United States

Last updated: June 24, 2025

In Chapel Hill, United States, the average temperature in September hovers around 23°C (74°F), offering a pleasant climate. However, be prepared for a range of temperatures, with minimums dipping to 8°C (47°F) and maximums soaring to 36°C (97°F). During this month, you can expect 121 mm (4.8 in) of precipitation spread over 10 days, contributing to an average humidity of 64%. So, pack accordingly for a mix of warmth and occasional showers!

September Temperature in Chapel Hill

In September in Chapel Hill, the average temperature is 23°C (74°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 8°C (47°F). This makes it an ideal destination for travelers seeking warm weather, but be prepared for cooler evenings.

September Weather in Chapel Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chapel Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chapel Hill, September typically has an average temperature of 23°C (74°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec414653597076807874634946
Data source: Temperature data for Chapel Hill generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Chapel Hill

In Chapel Hill in September, the precipitation amount is 121 mm (4.8 in) spread over a period of 10 days.

September Precipitation Trends in Chapel Hill

The chart displays monthly precipitation patterns in Chapel Hill, 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 Chapel Hill, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10818317615211513713312112112679151
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chapel Hill

In Chapel Hill in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Chapel Hill

This chart illustrates the average monthly humidity levels in Chapel Hill, 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 Chapel Hill is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chapel Hill

In Chapel Hill 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 Chapel Hill.

Maximum UV Index Levels in Chapel Hill for September

The chart shows the monthly maximum UV Index (UVI) for Chapel Hill 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 Chapel Hill typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Chapel Hill 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 Chapel Hill Compares to Other Months

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

This table compares monthly weather conditions in Chapel Hill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)108 mm (4.3 inches)87%moderate
February Weather8°C (46°F)183 mm (7.2 inches)87%high
March Weather12°C (53°F)176 mm (6.9 inches)85%high
April Weather15°C (60°F)152 mm (6.0 inches)82%very high
May Weather21°C (70°F)115 mm (4.5 inches)83%very high
June Weather25°C (77°F)137 mm (5.4 inches)82%extreme
July Weather26°C (80°F)133 mm (5.2 inches)78%extreme
August Weather25°C (78°F)121 mm (4.8 inches)67%very high
September Weather23°C (74°F)121 mm (4.8 inches)64%very high
October Weather17°C (64°F)126 mm (5.0 inches)74%high
November Weather9°C (49°F)79 mm (3.1 inches)87%moderate
December Weather8°C (46°F)151 mm (6.0 inches)88%moderate

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