Last updated: June 24, 2025
In September, the average temperature in Piermont, United States hovers around 15°C (60°F), with fluctuations ranging from a chilly -4°C (25°F) to a warm 31°C (87°F). Expect about 63 mm (2.5 in) of precipitation over 9 days, accompanied by an average humidity level of 71%. Whether you’re gearing up for a cozy sweater day or planning for a sunny outing, be prepared for the delightful variability of this month!
In September in Piermont, the average temperature is 15°C (60°F), with maximums reaching 31°C (87°F) and minimums dropping as low as -4°C (25°F). This temperature range makes Piermont a versatile destination for travelers, offering a mix of warm and cool days for various activities.
In Piermont in September, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.
In Piermont in September humidity is 71%. With an average temperature of 15°C (60°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you feel sticky and sluggish.
In Piermont 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 Piermont.
UV Risk Categories
Weather in Piermont varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Piermont, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 75 mm (3.0 inches) | 86% | low |
| February Weather | -5°C (23°F) | 77 mm (3.0 inches) | 84% | moderate |
| March Weather | -2°C (29°F) | 66 mm (2.6 inches) | 82% | high |
| April Weather | 6°C (42°F) | 114 mm (4.5 inches) | 80% | very high |
| May Weather | 12°C (55°F) | 90 mm (3.5 inches) | 72% | very high |
| June Weather | 18°C (64°F) | 93 mm (3.7 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 123 mm (4.9 inches) | 67% | very high |
| August Weather | 19°C (67°F) | 82 mm (3.2 inches) | 66% | very high |
| September Weather | 15°C (60°F) | 63 mm (2.5 inches) | 71% | high |
| October Weather | 9°C (49°F) | 128 mm (5.1 inches) | 78% | moderate |
| November Weather | 1°C (34°F) | 102 mm (4.0 inches) | 84% | moderate |
| December Weather | -5°C (24°F) | 91 mm (3.6 inches) | 81% | low |