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September Weather in Winthrop, United States

Last updated: June 24, 2025

In Winthrop, United States, the average temperature in September hovers around 17°C (63°F), with a minimum of 2°C (37°F) and a maximum reaching up to 30°C (87°F). During this month, expect approximately 73 mm (2.9 in) of precipitation spread over 8 days. The average humidity is quite high at 77%, making for a rather humid atmosphere.

September Temperature in Winthrop

In September in Winthrop, the average temperature is 17°C (63°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as 2°C (37°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm days and cooler evenings.

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 17°C (63°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec232531435565707062513727
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) over a span of 8 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 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec82847211879671178573128107114
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 77%. With an average temperature of 17°C (63°F), this humidity feels like a cozy blanket wrapped around you, creating a muggy atmosphere that can be a bit uncomfortable for traveling, making you want to seek shade and hydration as you explore.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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-5°C (23°F)82 mm (3.2 inches)91%low
February Weather-4°C (25°F)84 mm (3.3 inches)89%moderate
March Weather0°C (32°F)72 mm (2.8 inches)85%moderate
April Weather6°C (44°F)118 mm (4.6 inches)84%very high
May Weather13°C (55°F)79 mm (3.1 inches)78%very high
June Weather18°C (65°F)67 mm (2.6 inches)72%very high
July Weather21°C (71°F)117 mm (4.6 inches)75%very high
August Weather21°C (70°F)85 mm (3.3 inches)74%very high
September Weather17°C (63°F)73 mm (2.9 inches)77%high
October Weather11°C (52°F)128 mm (5.1 inches)85%moderate
November Weather3°C (38°F)107 mm (4.2 inches)86%moderate
December Weather-3°C (27°F)114 mm (4.5 inches)85%low

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