Last updated: June 24, 2025
In Winthrop, United States, the average temperature in September hovers around 18°C (65°F). Expect a range from a chilly 2°C (35°F) at its lowest to a warm 33°C (92°F) at its peak. With an average precipitation of 120 mm (4.7 in) spread over 10 days, you might want to pack an umbrella. The air tends to feel humid, with an average humidity of 81%, contributing to a warm and damp atmosphere.
In September in Winthrop, the average temperature is 18°C (65°F). The maximum can reach 33°C (92°F), while the minimum can drop as low as 2°C (35°F). This diverse climate makes Winthrop a great destination for travelers seeking both warmth and cool, refreshing conditions.
In Winthrop in September, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 days.
In Winthrop in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.
In Winthrop 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 Winthrop.
UV Risk Categories
Weather in Winthrop varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Winthrop, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -9°C (16°F) | 29 mm (1.1 inches) | 87% | moderate |
February Weather | -9°C (16°F) | 30 mm (1.2 inches) | 90% | moderate |
March Weather | 1°C (33°F) | 63 mm (2.5 inches) | 85% | moderate |
April Weather | 6°C (44°F) | 82 mm (3.2 inches) | 84% | very high |
May Weather | 15°C (60°F) | 130 mm (5.1 inches) | 78% | very high |
June Weather | 22°C (72°F) | 101 mm (4.0 inches) | 80% | very high |
July Weather | 23°C (74°F) | 123 mm (4.9 inches) | 81% | very high |
August Weather | 21°C (71°F) | 127 mm (5.0 inches) | 81% | very high |
September Weather | 18°C (65°F) | 120 mm (4.7 inches) | 81% | very high |
October Weather | 9°C (49°F) | 96 mm (3.8 inches) | 84% | moderate |
November Weather | 1°C (34°F) | 31 mm (1.2 inches) | 88% | moderate |
December Weather | -5°C (24°F) | 42 mm (1.7 inches) | 84% | low |