Last updated: June 24, 2025
In September, the average temperature in Winthrop, United States hovers around 19°C (66°F), offering a pleasant climate for outdoor activities. Expect minimums to drop to 2°C (37°F), while the maximums can soar up to 33°C (91°F). With an average precipitation of 130 mm (5.1 in) spread over 10 days, it's wise to be prepared for occasional showers. The air remains humid, with an average humidity level of 74%, creating a uniquely tropical atmosphere.
In September in Winthrop, the average temperature is 19°C (66°F). The maximum can reach 33°C (91°F) and the minimum can be as low as 2°C (37°F). This varying climate makes Winthrop a versatile destination for travelers seeking both warm and cool experiences.
In Winthrop in September, the precipitation amount is 130 mm (5.1 in) over a period of 10 days.
In Winthrop in September humidity is 74%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it ideal for leisurely outdoor exploration but potentially heavy for those not accustomed to tropical conditions.
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 | -7°C (20°F) | 44 mm (1.7 inches) | 84% | moderate |
| February Weather | -6°C (21°F) | 54 mm (2.1 inches) | 85% | moderate |
| March Weather | 2°C (37°F) | 68 mm (2.7 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 78 mm (3.1 inches) | 83% | very high |
| May Weather | 16°C (61°F) | 173 mm (6.8 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 139 mm (5.5 inches) | 79% | extreme |
| July Weather | 24°C (75°F) | 111 mm (4.4 inches) | 75% | very high |
| August Weather | 22°C (71°F) | 94 mm (3.7 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 130 mm (5.1 inches) | 74% | very high |
| October Weather | 11°C (51°F) | 144 mm (5.7 inches) | 79% | moderate |
| November Weather | 2°C (36°F) | 47 mm (1.8 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 39 mm (1.6 inches) | 82% | moderate |