Last updated: June 24, 2025
In September, the average temperature in Mercerville-Hamilton Square, United States hovers around 21°C (70°F). Expect a range where the minimum can dip to 6°C (43°F) while the mercury can soar up to 35°C (95°F). With 87 mm (3.4 in) of precipitation over approximately 10 days, and an average humidity of 68%, be prepared for a mix of conditions that can add both vibrancy and vitality to your visit.
In September in Mercerville-Hamilton Square, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F) and minimums can be as low as 6°C (43°F). This range makes it an ideal time for travelers seeking a variety of outdoor experiences, from warm afternoons to cooler evenings.
In Mercerville-Hamilton Square in September, the precipitation amount is 87 mm (3.4 in) over the course of 10 days.
In Mercerville-Hamilton Square in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.
In Mercerville-Hamilton Square in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Mercerville-Hamilton Square.
UV Risk Categories
Weather in Mercerville-Hamilton Square varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mercerville-Hamilton Square, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (35°F) | 64 mm (2.5 inches) | 84% | moderate |
| February Weather | 3°C (38°F) | 109 mm (4.3 inches) | 82% | moderate |
| March Weather | 6°C (43°F) | 109 mm (4.3 inches) | 81% | high |
| April Weather | 12°C (54°F) | 106 mm (4.2 inches) | 78% | very high |
| May Weather | 17°C (63°F) | 131 mm (5.1 inches) | 69% | very high |
| June Weather | 22°C (73°F) | 100 mm (3.9 inches) | 69% | very high |
| July Weather | 26°C (78°F) | 139 mm (5.5 inches) | 62% | very high |
| August Weather | 24°C (76°F) | 135 mm (5.3 inches) | 65% | very high |
| September Weather | 21°C (70°F) | 87 mm (3.4 inches) | 68% | very high |
| October Weather | 16°C (61°F) | 121 mm (4.8 inches) | 74% | high |
| November Weather | 8°C (46°F) | 83 mm (3.3 inches) | 82% | moderate |
| December Weather | 4°C (39°F) | 104 mm (4.1 inches) | 80% | low |