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%.
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.
In Mount Holly in September, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.
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.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| 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 Weather | 6°C (42°F) | 129 mm (5.1 inches) | 84% | very high |
| May Weather | 13°C (55°F) | 101 mm (4.0 inches) | 76% | very high |
| June Weather | 18°C (64°F) | 118 mm (4.6 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 167 mm (6.6 inches) | 66% | very high |
| August Weather | 19°C (67°F) | 113 mm (4.5 inches) | 64% | very high |
| September Weather | 15°C (60°F) | 86 mm (3.4 inches) | 72% | high |
| October Weather | 9°C (49°F) | 155 mm (6.1 inches) | 81% | moderate |
| November Weather | 1°C (34°F) | 108 mm (4.3 inches) | 87% | moderate |
| December Weather | -4°C (25°F) | 99 mm (3.9 inches) | 84% | low |