Last updated: June 24, 2025
In Waterbury, United States, the average temperature in September hovers around 15°C (59°F), offering a mild climate. Expect temperature fluctuations, with a minimum dipping to -5°C (23°F) and a maximum soaring up to 30°C (87°F). During this month, the region experiences an average precipitation of 79 mm (3.1 in) over 9 days, contributing to a humidity level of 78%. Whether you're enjoying the cool breezes or gearing up for occasional rain, Waterbury has something to offer!
In September in Waterbury, the average temperature is 15°C (59°F). The maximum can reach 30°C (87°F), and the minimum can drop as low as -5°C (23°F). Be prepared for both warm days and chilly nights when traveling to Waterbury during this month.
In Waterbury in September, the precipitation amount is 79 mm (3.1 in) spread over 9 days.
In Waterbury in September, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.
In Waterbury 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 Waterbury.
UV Risk Categories
Weather in Waterbury varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Waterbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 87 mm (3.4 inches) | 93% | low |
| February Weather | -6°C (21°F) | 89 mm (3.5 inches) | 92% | moderate |
| March Weather | -2°C (28°F) | 84 mm (3.3 inches) | 86% | moderate |
| April Weather | 5°C (41°F) | 125 mm (4.9 inches) | 85% | very high |
| May Weather | 12°C (54°F) | 110 mm (4.3 inches) | 80% | very high |
| June Weather | 17°C (63°F) | 121 mm (4.8 inches) | 74% | very high |
| July Weather | 20°C (68°F) | 140 mm (5.5 inches) | 76% | very high |
| August Weather | 19°C (66°F) | 104 mm (4.1 inches) | 75% | very high |
| September Weather | 15°C (59°F) | 79 mm (3.1 inches) | 78% | high |
| October Weather | 9°C (48°F) | 158 mm (6.2 inches) | 86% | moderate |
| November Weather | 0°C (32°F) | 117 mm (4.6 inches) | 88% | moderate |
| December Weather | -5°C (23°F) | 92 mm (3.6 inches) | 89% | low |