September Weather in Mount Holly, United States

Last updated: June 24, 2025

In Mount Holly, United States, the average temperature in September hovers around 15°C (60°F). However, be prepared for a temperature range that can dip to a brisk -2°C (29°F) at its lowest and soar up to a balmy 30°C (87°F) at its peak. During this month, expect about 86 mm (3.4 in) of precipitation spread over 9 days, with an average humidity of 72%.

September Temperature in Mount Holly

In September in Mount Holly, the average temperature is 15°C (60°F). Maximums can reach 30°C (87°F), while minimums can drop as low as -2°C (29°F). Therefore, it's essential to pack layers to stay comfortable, as you may experience both warm and chilly weather during your travels.

September Weather in Mount Holly: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mount Holly, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Holly, September typically has an average temperature of 15°C (60°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec202329425564696760483425
Data source: Temperature data for Mount Holly 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 Mount Holly

In Mount Holly in September, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.

September Precipitation Trends in Mount Holly

The chart displays monthly precipitation patterns in Mount Holly, 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 Mount Holly, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7889791291011181681138615510899
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mount Holly

In Mount Holly in September humidity is 72%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, creating a slightly muggy atmosphere that can make strolling around a bit sticky. Travelers might find themselves longing for a refreshing breeze, and it’s advisable to stay hydrated while exploring local sights.

September Average Humidity in Mount Holly

This chart illustrates the average monthly humidity levels in Mount Holly, 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 Mount Holly is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mount Holly

In Mount Holly 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 Mount Holly.

Maximum UV Index Levels in Mount Holly for September

The chart shows the monthly maximum UV Index (UVI) for Mount Holly 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 Mount Holly typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997532
Data source: Mount Holly 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 Mount Holly Compares to Other Months

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

This table compares monthly weather conditions in Mount Holly, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)78 mm (3.1 inches)89%moderate
February Weather-5°C (23°F)89 mm (3.5 inches)88%moderate
March Weather-1°C (30°F)79 mm (3.1 inches)86%high
April Weather6°C (42°F)129 mm (5.1 inches)84%very high
May Weather13°C (55°F)101 mm (4.0 inches)76%very high
June Weather18°C (64°F)118 mm (4.6 inches)72%very high
July Weather20°C (69°F)167 mm (6.6 inches)66%very high
August Weather19°C (67°F)113 mm (4.5 inches)64%very high
September Weather15°C (60°F)86 mm (3.4 inches)72%high
October Weather9°C (49°F)155 mm (6.1 inches)81%moderate
November Weather1°C (34°F)108 mm (4.3 inches)87%moderate
December Weather-4°C (25°F)99 mm (3.9 inches)84%low

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