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September Weather in Llangefni, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Llangefni, United Kingdom is a comfortable 14°C (57°F). Expect chilly lows of 3°C (38°F) and delightful highs reaching up to 27°C (81°F). The month brings 98 mm (3.9 in) of precipitation spread across 15 days, contributing to an average humidity of 85%. Prepare for a blend of cool and warm days in this vibrant season!

September Temperature in Llangefni

In September in Llangefni, the average temperature is 14°C (57°F). Maximum temperatures can reach 27°C (81°F), while minimums can drop to as low as 3°C (38°F). This variation makes it a perfect time to explore and enjoy the diverse outdoor activities available in Llangefni.

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

The chart illustrates September temperature patterns in Llangefni, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Llangefni, September typically has an average temperature of 14°C (57°F), with highs reaching up to 27°C (81°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485358616057524745
Data source: Temperature data for Llangefni 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 Llangefni

In Llangefni in September, the total precipitation amount is 98 mm (3.9 in) spread over 15 days.

September Precipitation Trends in Llangefni

The chart displays monthly precipitation patterns in Llangefni, 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 Llangefni, September typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec771031045571918210598128111129
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llangefni

In Llangefni in September, humidity is 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

September Average Humidity in Llangefni

This chart illustrates the average monthly humidity levels in Llangefni, 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 Llangefni 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 Llangefni

In Llangefni 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 Llangefni.

Maximum UV Index Levels in Llangefni for September

The chart shows the monthly maximum UV Index (UVI) for Llangefni 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 Llangefni typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Llangefni 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 Llangefni Compares to Other Months

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

This table compares monthly weather conditions in Llangefni, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)77 mm (3.0 inches)89%low
February Weather6°C (44°F)103 mm (4.1 inches)88%low
March Weather7°C (45°F)104 mm (4.1 inches)86%moderate
April Weather9°C (48°F)55 mm (2.2 inches)84%moderate
May Weather12°C (53°F)71 mm (2.8 inches)79%high
June Weather15°C (59°F)91 mm (3.6 inches)81%very high
July Weather16°C (61°F)82 mm (3.2 inches)78%very high
August Weather16°C (61°F)105 mm (4.1 inches)79%high
September Weather14°C (57°F)98 mm (3.9 inches)85%moderate
October Weather11°C (53°F)128 mm (5.1 inches)90%moderate
November Weather9°C (48°F)111 mm (4.4 inches)91%low
December Weather7°C (45°F)129 mm (5.1 inches)89%low

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