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September Weather in Llanfechell, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Llanfechell, United Kingdom is a comfortable 15°C (59°F). Expect a minimum of 11°C (51°F) and a maximum of 21°C (70°F), providing a pleasant range for outdoor activities. However, be prepared for the 101 mm (4.0 in) of precipitation spread over 15 days, coupled with an average humidity of 85%.

September Temperature in Llanfechell

In September in Llanfechell, the average temperature is 15°C (59°F). The maximum can reach 21°C (70°F) and the minimum can be as low as 11°C (51°F). This mild climate makes it a great time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Llanfechell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Llanfechell, September typically has an average temperature of 15°C (59°F), with highs reaching up to 21°C (70°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec464546485256596059555147
Data source: Temperature data for Llanfechell 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 Llanfechell

In Llanfechell in September, the total precipitation amount is 101 mm (4.0 in) over the course of 15 days.

September Precipitation Trends in Llanfechell

The chart displays monthly precipitation patterns in Llanfechell, 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 Llanfechell, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec8799914146776891101147142145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llanfechell

In Llanfechell in September, humidity is 85%. With an average temperature of 15°C (59°F), this humidity feels like a warm, damp blanket wrapping around you, making traveling quite uncomfortable and sticky. Be prepared to take frequent breaks and stay hydrated as you navigate the lush, but humid environment.

September Average Humidity in Llanfechell

This chart illustrates the average monthly humidity levels in Llanfechell, 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 Llanfechell is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Llanfechell

In Llanfechell in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Llanfechell.

Maximum UV Index Levels in Llanfechell for September

The chart shows the monthly maximum UV Index (UVI) for Llanfechell 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 Llanfechell typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Llanfechell 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 Llanfechell Compares to Other Months

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

This table compares monthly weather conditions in Llanfechell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)87 mm (3.4 inches)89%low
February Weather7°C (46°F)99 mm (3.9 inches)88%low
March Weather8°C (46°F)91 mm (3.6 inches)86%moderate
April Weather9°C (48°F)41 mm (1.6 inches)84%moderate
May Weather11°C (52°F)46 mm (1.8 inches)79%high
June Weather13°C (56°F)77 mm (3.0 inches)81%very high
July Weather15°C (59°F)68 mm (2.7 inches)78%very high
August Weather16°C (60°F)91 mm (3.6 inches)79%high
September Weather15°C (59°F)101 mm (4.0 inches)85%moderate
October Weather13°C (55°F)147 mm (5.8 inches)90%moderate
November Weather10°C (51°F)142 mm (5.6 inches)91%low
December Weather9°C (48°F)145 mm (5.7 inches)89%low

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