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September Weather in Frenchtown, United States

Last updated: June 24, 2025

In Frenchtown, United States, the average temperature in September hovers around 13°C (55°F). Expect a wide range, with minimum temperatures dipping to -4°C (25°F) and maximums reaching 32°C (90°F). During this month, rainfall totals about 38 mm (1.5 in), typically spread over 7 days, contributing to an average humidity of 67%.

September Temperature in Frenchtown

In September in Frenchtown, the average temperature is 13°C (55°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -4°C (25°F). This temperature range suggests that travelers should prepare for both warm days and possibly chilly nights.

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

The chart illustrates September temperature patterns in Frenchtown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Frenchtown, September typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec242132384957676555403226
Data source: Temperature data for Frenchtown 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 Frenchtown

In Frenchtown in September, the precipitation amount is 38 mm (1.5 in) over the course of 7 days.

September Precipitation Trends in Frenchtown

The chart displays monthly precipitation patterns in Frenchtown, 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 Frenchtown, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec5110361808575222938727372
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Frenchtown

In Frenchtown in September humidity is 67%. With an average temperature of 13°C (55°F), this humidity feels like a chilly embrace, making travel a bit uncomfortable as the cool air settles in.

September Average Humidity in Frenchtown

This chart illustrates the average monthly humidity levels in Frenchtown, 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 Frenchtown is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%85%80%78%77%66%67%77%89%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Frenchtown

In Frenchtown 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 Frenchtown.

Maximum UV Index Levels in Frenchtown for September

The chart shows the monthly maximum UV Index (UVI) for Frenchtown 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 Frenchtown typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
Data source: Frenchtown 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 Frenchtown Compares to Other Months

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

This table compares monthly weather conditions in Frenchtown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)51 mm (2.0 inches)93%low
February Weather-6°C (22°F)103 mm (4.1 inches)92%moderate
March Weather0°C (32°F)61 mm (2.4 inches)89%high
April Weather3°C (38°F)80 mm (3.2 inches)85%high
May Weather9°C (49°F)85 mm (3.4 inches)80%very high
June Weather14°C (58°F)75 mm (3.0 inches)78%very high
July Weather19°C (67°F)22 mm (0.9 inches)77%very high
August Weather19°C (66°F)29 mm (1.2 inches)66%very high
September Weather13°C (55°F)38 mm (1.5 inches)67%high
October Weather5°C (41°F)72 mm (2.8 inches)77%moderate
November Weather0°C (32°F)73 mm (2.9 inches)89%moderate
December Weather-3°C (26°F)72 mm (2.9 inches)95%low

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