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September Weather in Llangathen, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Llangathen, United Kingdom hovers around a comfortable 13°C (56°F). Expect minimum temperatures to dip to 1°C (33°F), while the mercury can soar to a pleasant 27°C (81°F) on warmer days. Be prepared for some rain, as 110 mm (4.3 in) of precipitation is expected over 14 days, all wrapped in an average humidity of 79%.

September Temperature in Llangathen

In September in Llangathen, the average temperature is 13°C (56°F), with maximums reaching 27°C (81°F) and minimums dropping as low as 1°C (33°F). Expect cool to warm days, perfect for exploring the outdoors while layering for the cooler evenings.

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

The chart illustrates September temperature patterns in Llangathen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Llangathen, September typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (81°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec414243475258615956514543
Data source: Temperature data for Llangathen 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 Llangathen

In Llangathen in September, the total precipitation amount is 110 mm (4.3 in) spread over 14 days.

September Precipitation Trends in Llangathen

The chart displays monthly precipitation patterns in Llangathen, 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 Llangathen, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec951401256699103101133110155132166
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llangathen

In Llangathen in September, humidity is 79%. With an average temperature of 13°C (56°F), this humidity feels like a damp, cool blanket wrapping around you, making traveling slightly uncomfortable and requiring you to dress in layers to stay comfortable while exploring.

September Average Humidity in Llangathen

This chart illustrates the average monthly humidity levels in Llangathen, 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 Llangathen is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Llangathen

In Llangathen 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 Llangathen, you can refer to this Hourly UV Index in Llangathen.

Maximum UV Index Levels in Llangathen for September

The chart shows the monthly maximum UV Index (UVI) for Llangathen 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 Llangathen typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Llangathen 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 Llangathen Compares to Other Months

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

This table compares monthly weather conditions in Llangathen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)95 mm (3.7 inches)88%low
February Weather5°C (42°F)140 mm (5.5 inches)88%low
March Weather6°C (44°F)125 mm (4.9 inches)86%moderate
April Weather8°C (48°F)66 mm (2.6 inches)84%high
May Weather11°C (52°F)99 mm (3.9 inches)80%high
June Weather14°C (58°F)103 mm (4.1 inches)80%very high
July Weather16°C (61°F)101 mm (4.0 inches)70%very high
August Weather15°C (60°F)133 mm (5.2 inches)73%high
September Weather13°C (56°F)110 mm (4.3 inches)79%high
October Weather10°C (51°F)155 mm (6.1 inches)89%moderate
November Weather7°C (46°F)132 mm (5.2 inches)90%low
December Weather6°C (43°F)166 mm (6.5 inches)89%low

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