Last updated: June 24, 2025
In Southbury, United States, the average temperature in September hovers around 19°C (67°F). Expect minimums to dip to 4°C (40°F) and maximums to soar up to 33°C (92°F). This month, prepare for about 114 mm (4.5 in) of precipitation spread over 9 days. With an average humidity of 68%, it's a time to embrace the mix of warmth and refreshing rain!
In September in Southbury, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.
In Southbury in September, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.
In Southbury in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.
In Southbury 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 Southbury.
UV Risk Categories
Weather in Southbury varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Southbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -1°C (31°F) | 71 mm (2.8 inches) | 84% | moderate |
February Weather | 1°C (33°F) | 96 mm (3.8 inches) | 82% | moderate |
March Weather | 4°C (39°F) | 91 mm (3.6 inches) | 81% | high |
April Weather | 9°C (49°F) | 129 mm (5.1 inches) | 78% | very high |
May Weather | 15°C (59°F) | 112 mm (4.4 inches) | 69% | very high |
June Weather | 20°C (69°F) | 102 mm (4.0 inches) | 69% | very high |
July Weather | 24°C (75°F) | 143 mm (5.6 inches) | 62% | very high |
August Weather | 23°C (73°F) | 106 mm (4.2 inches) | 65% | very high |
September Weather | 19°C (67°F) | 114 mm (4.5 inches) | 68% | very high |
October Weather | 14°C (57°F) | 143 mm (5.6 inches) | 74% | high |
November Weather | 6°C (43°F) | 94 mm (3.7 inches) | 82% | moderate |
December Weather | 1°C (35°F) | 121 mm (4.8 inches) | 80% | low |