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September Weather in Flandreau, United States

Last updated: June 24, 2025

In Flandreau, United States, the average temperature in September hovers around 18°C (64°F). Visitors can expect a range between a chilly 2°C (37°F) and a warm 32°C (89°F). This month also brings about 109 mm (4.3 in) of precipitation over approximately 9 days, complemented by an average humidity of 75%. Be prepared for a mix of cozy coolness and refreshing warmth!

September Temperature in Flandreau

In September, in Flandreau, the average temperature is 18°C (64°F). The maximum can reach 32°C (89°F), and the minimum can be as low as 2°C (37°F). This diverse temperature range makes Flandreau an ideal destination for travelers who enjoy both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Flandreau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flandreau, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (89°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec171733435771737064463325
Data source: Temperature data for Flandreau 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 Flandreau

In Flandreau in September, the total precipitation amount is 109 mm (4.3 in) spread over 9 days.

September Precipitation Trends in Flandreau

The chart displays monthly precipitation patterns in Flandreau, 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 Flandreau, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec2224597511891103114109802837
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Flandreau

In Flandreau in September, humidity is 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

September Average Humidity in Flandreau

This chart illustrates the average monthly humidity levels in Flandreau, 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 Flandreau is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%84%75%79%74%81%82%80%75%77%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Flandreau

In Flandreau 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 Flandreau.

Maximum UV Index Levels in Flandreau for September

The chart shows the monthly maximum UV Index (UVI) for Flandreau 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 Flandreau typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098532
Data source: Flandreau 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 Flandreau Compares to Other Months

Weather in Flandreau varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Flandreau, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Flandreau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)21 mm (0.8 inches)80%moderate
February Weather-8°C (17°F)24 mm (0.9 inches)84%moderate
March Weather0°C (33°F)59 mm (2.3 inches)75%high
April Weather6°C (43°F)74 mm (2.9 inches)79%very high
May Weather14°C (58°F)118 mm (4.6 inches)74%very high
June Weather22°C (71°F)91 mm (3.6 inches)81%extreme
July Weather23°C (74°F)103 mm (4.1 inches)82%very high
August Weather21°C (70°F)114 mm (4.5 inches)80%very high
September Weather18°C (64°F)109 mm (4.3 inches)75%very high
October Weather8°C (47°F)80 mm (3.1 inches)77%moderate
November Weather1°C (33°F)28 mm (1.1 inches)85%moderate
December Weather-4°C (25°F)37 mm (1.5 inches)83%low

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