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September Weather in Trefflean, France

Last updated: August 23, 2025

The average temperature in Trefflean, France during September is a pleasant 16°C (62°F). Daily temperatures can fluctuate, with a minimum of 6°C (42°F) and a maximum reaching up to 31°C (89°F). Expect about 42 mm (1.7 in) of precipitation over roughly 8 days, accompanied by an average humidity of 79%.

September Temperature in Trefflean

In September in Trefflean, the average temperature is 16°C (62°F). The maximum can reach 31°C (89°F), and the minimum can be as low as 6°C (42°F). This pleasant climate makes it a great time to explore outdoor attractions and enjoy the local scenery.

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

The chart illustrates September temperature patterns in Trefflean, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trefflean, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec434548525763666561564846
Data source: Temperature data for Trefflean 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 Trefflean

In Trefflean in September, the precipitation amount is 42 mm (1.7 in) over the course of 8 days.

September Precipitation Trends in Trefflean

The chart displays monthly precipitation patterns in Trefflean, 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 Trefflean, September typically receives around 42 mm (1.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4767624868914851428872100
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Trefflean

In Trefflean in September, humidity is 79%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that makes walking outdoors feel languid and heavy, demanding frequent breaks and plenty of water as you navigate the bustling streets.

September Average Humidity in Trefflean

This chart illustrates the average monthly humidity levels in Trefflean, 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 Trefflean is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%81%82%82%80%77%78%79%82%81%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Trefflean

In Trefflean in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Trefflean, you can refer to this Hourly UV Index in Trefflean.

Maximum UV Index Levels in Trefflean for September

The chart shows the monthly maximum UV Index (UVI) for Trefflean 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 Trefflean typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986522
Data source: Trefflean 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 Trefflean Compares to Other Months

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

This table compares monthly weather conditions in Trefflean, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)47 mm (1.8 inches)82%low
February Weather7°C (46°F)67 mm (2.6 inches)83%moderate
March Weather9°C (48°F)62 mm (2.5 inches)81%moderate
April Weather11°C (53°F)48 mm (1.9 inches)82%high
May Weather14°C (58°F)68 mm (2.7 inches)82%very high
June Weather17°C (64°F)91 mm (3.6 inches)80%very high
July Weather19°C (67°F)48 mm (1.9 inches)77%very high
August Weather18°C (65°F)50 mm (2.0 inches)78%very high
September Weather16°C (62°F)42 mm (1.7 inches)79%high
October Weather13°C (56°F)88 mm (3.5 inches)82%moderate
November Weather9°C (48°F)72 mm (2.8 inches)81%low
December Weather8°C (46°F)100 mm (3.9 inches)82%low

Compare Trefflean's Climate with Cities Worldwide