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September Weather in Frankfort, United States

Last updated: June 24, 2025

In September, the average temperature in Frankfort, United States hovers around 22°C (72°F). Expect a minimum dip to 5°C (42°F) and peaks reaching 37°C (99°F). Rainfall is modest, with an average precipitation of 65 mm (2.6 in) spread over about 6 days. On top of that, the average humidity is a comfortable 71%, creating a pleasant atmosphere for your visit!

September Temperature in Frankfort

In September in Frankfort, the average temperature is 22°C (72°F). Maximums can reach 37°C (99°F) and minimums can drop as low as 5°C (42°F). This means that travelers should be prepared for a wide range of temperatures, ensuring they pack both lighter clothing for the warm days and warmer layers for the cooler evenings.

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 22°C (72°F), with highs reaching up to 37°C (99°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec293045536577807672554336
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 precipitation amount is 65 mm (2.6 in) over a period of 6 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 65 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec3030897620410084101651193426
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 71%. With an average temperature of 22°C (72°F), this humidity feels like the air is thick and slightly stifling, making outdoor activities require frequent breaks to stay hydrated and cool.

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 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-1°C (30°F)30 mm (1.2 inches)76%moderate
February Weather-1°C (30°F)30 mm (1.2 inches)77%moderate
March Weather7°C (45°F)89 mm (3.5 inches)70%high
April Weather12°C (53°F)76 mm (3.0 inches)73%very high
May Weather18°C (65°F)204 mm (8.0 inches)82%very high
June Weather25°C (77°F)100 mm (3.9 inches)82%extreme
July Weather27°C (80°F)84 mm (3.3 inches)81%extreme
August Weather25°C (77°F)101 mm (4.0 inches)78%very high
September Weather22°C (72°F)65 mm (2.6 inches)71%very high
October Weather13°C (55°F)119 mm (4.7 inches)71%high
November Weather6°C (43°F)34 mm (1.3 inches)81%moderate
December Weather2°C (36°F)26 mm (1.0 inches)84%moderate

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