Last updated: June 24, 2025
In September, the average temperature in Setauket-East Setauket, United States hovers around 21°C (70°F). Expect a comfortable range with a minimum of 11°C (52°F) and a peak reaching 30°C (87°F). However, be prepared for some rain, as 94 mm (3.7 in) of precipitation is likely over 10 days. With an average humidity of 68%, it’s a great time to enjoy the warmth while staying hydrated!
In September, in Setauket-East Setauket, the average temperature is 21°C (70°F). The maximum can reach 30°C (87°F) and the minimum can be as low as 11°C (52°F). This pleasant climate makes Setauket-East Setauket an ideal destination for travelers seeking comfortable weather and outdoor activities.
In Setauket-East Setauket in September, the precipitation amount is 94 mm (3.7 in) over a duration of 10 days.
In Setauket-East Setauket 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 Setauket-East Setauket 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 Setauket-East Setauket.
UV Risk Categories
Weather in Setauket-East Setauket varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Setauket-East Setauket, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (35°F) | 80 mm (3.1 inches) | 84% | moderate |
| February Weather | 2°C (36°F) | 112 mm (4.4 inches) | 82% | moderate |
| March Weather | 4°C (40°F) | 104 mm (4.1 inches) | 81% | high |
| April Weather | 9°C (49°F) | 132 mm (5.2 inches) | 78% | very high |
| May Weather | 14°C (58°F) | 119 mm (4.7 inches) | 69% | very high |
| June Weather | 20°C (68°F) | 87 mm (3.4 inches) | 69% | very high |
| July Weather | 24°C (76°F) | 131 mm (5.2 inches) | 62% | very high |
| August Weather | 24°C (75°F) | 103 mm (4.0 inches) | 65% | very high |
| September Weather | 21°C (70°F) | 94 mm (3.7 inches) | 68% | very high |
| October Weather | 16°C (61°F) | 143 mm (5.6 inches) | 74% | high |
| November Weather | 9°C (49°F) | 103 mm (4.0 inches) | 82% | moderate |
| December Weather | 5°C (40°F) | 140 mm (5.5 inches) | 80% | low |