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September Weather in Winthrop, United States

Last updated: June 24, 2025

In September, the average temperature in Winthrop, United States hovers around 16°C (61°F), with extremes ranging from a chilly -1°C (30°F) to a sweltering 32°C (90°F). You can expect about 73 mm (2.9 in) of precipitation spread over 9 days, and the air tends to feel quite humid, with an average humidity of 78%.

September Temperature in Winthrop

In September in Winthrop, the average temperature is 16°C (61°F). The maximum can reach 32°C (90°F), and the minimum can be as low as -1°C (30°F). This wide range of temperatures means travelers should be prepared for both warm days and chilly nights.

September Weather in Winthrop: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Winthrop, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winthrop, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec202330445765716961503526
Data source: Temperature data for Winthrop generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Winthrop

In Winthrop in September, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.

September Precipitation Trends in Winthrop

The chart displays monthly precipitation patterns in Winthrop, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Winthrop, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9086911231101041191077314811688
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Winthrop

In Winthrop in September, humidity is 78%. With an average temperature of 16°C (61°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as it clings to your skin and creates a heavy atmosphere that can drain your energy.

September Average Humidity in Winthrop

This chart illustrates the average monthly humidity levels in Winthrop, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Winthrop is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Winthrop

In Winthrop 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 Winthrop.

Maximum UV Index Levels in Winthrop for September

The chart shows the monthly maximum UV Index (UVI) for Winthrop in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Winthrop typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899997532
Data source: Winthrop September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Winthrop Compares to Other Months

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.

This table compares monthly weather conditions in Winthrop, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)90 mm (3.6 inches)93%low
February Weather-5°C (23°F)86 mm (3.4 inches)92%moderate
March Weather-1°C (31°F)91 mm (3.6 inches)86%moderate
April Weather6°C (44°F)123 mm (4.8 inches)85%very high
May Weather14°C (57°F)110 mm (4.3 inches)80%very high
June Weather19°C (66°F)104 mm (4.1 inches)74%very high
July Weather22°C (71°F)119 mm (4.7 inches)76%very high
August Weather20°C (69°F)107 mm (4.2 inches)75%very high
September Weather16°C (61°F)73 mm (2.9 inches)78%high
October Weather10°C (51°F)148 mm (5.8 inches)86%moderate
November Weather2°C (35°F)116 mm (4.6 inches)88%moderate
December Weather-3°C (26°F)88 mm (3.5 inches)89%low

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