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September Weather in Frankfort, United States

Last updated: June 24, 2025

In Frankfort, United States, the average temperature in September is a comfortable 21°C (70°F). Expect minimums dipping to 5°C (41°F) and maximums soaring up to 33°C (92°F). During this month, you'll encounter approximately 67 mm (2.6 in) of precipitation over a span of 7 days, with an average humidity level of 78%.

September Temperature in Frankfort

In September in Frankfort, the average temperature is 21°C (70°F). The maximum can reach 33°C (92°F), while the minimum can dip as low as 5°C (41°F). This climate makes Frankfort an ideal destination for travelers looking to enjoy pleasant weather with a good range of temperatures.

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

The chart illustrates September temperature patterns in Frankfort, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Frankfort, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec293242516473767469574135
Data source: Temperature data for Frankfort 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 Frankfort

In Frankfort in September, the total precipitation amount is 67 mm (2.6 in) over a span of 7 days.

September Precipitation Trends in Frankfort

The chart displays monthly precipitation patterns in Frankfort, 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 Frankfort, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec78831109314610110294671078068
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Frankfort

In Frankfort in September, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

September Average Humidity in Frankfort

This chart illustrates the average monthly humidity levels in Frankfort, 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 Frankfort is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Frankfort

In Frankfort 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 Frankfort.

Maximum UV Index Levels in Frankfort for September

The chart shows the monthly maximum UV Index (UVI) for Frankfort 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 Frankfort typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Frankfort 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 Frankfort Compares to Other Months

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

This table compares monthly weather conditions in Frankfort, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)78 mm (3.1 inches)85%moderate
February Weather0°C (32°F)83 mm (3.3 inches)85%moderate
March Weather6°C (42°F)110 mm (4.3 inches)86%high
April Weather11°C (52°F)93 mm (3.6 inches)87%very high
May Weather18°C (64°F)146 mm (5.8 inches)81%very high
June Weather23°C (74°F)101 mm (4.0 inches)82%extreme
July Weather25°C (77°F)102 mm (4.0 inches)81%very high
August Weather23°C (74°F)94 mm (3.7 inches)79%very high
September Weather21°C (70°F)67 mm (2.6 inches)78%very high
October Weather14°C (58°F)107 mm (4.2 inches)81%high
November Weather5°C (41°F)80 mm (3.1 inches)89%moderate
December Weather2°C (35°F)68 mm (2.7 inches)86%low

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