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September Weather in Penllyn, United Kingdom

Last updated: August 27, 2025

The average temperature in Penllyn, United Kingdom during September is 15°C (59°F). You can expect a minimum of 5°C (41°F) and a maximum of 27°C (80°F). With precipitation amounting to 92 mm (3.6 in) over 12 days, it's wise to prepare for some rain. Plus, the average humidity hovers around 79%, creating a lush and vibrant atmosphere.

September Temperature in Penllyn

In September in Penllyn, the average temperature is 15°C (59°F). Maximums can reach 27°C (80°F), while minimums can dip as low as 5°C (41°F). This moderate climate makes Penllyn an ideal destination for travelers seeking to explore comfortably.

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

The chart illustrates September temperature patterns in Penllyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Penllyn, September typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (80°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec434345495459636258544845
Data source: Temperature data for Penllyn 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 Penllyn

In Penllyn in September, the precipitation amount is 92 mm (3.6 in) over the course of 12 days.

September Precipitation Trends in Penllyn

The chart displays monthly precipitation patterns in Penllyn, 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 Penllyn, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec831111015780858610693146111144
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Penllyn

In Penllyn in September humidity is 79%. With an average temperature of 15°C (59°F), this humidity feels like a muggy embrace that clings to your skin, making outdoor activities somewhat uncomfortable. Travelers may find themselves frequently seeking shelter or refreshing drinks to combat the warm, damp air, as the moisture in the atmosphere feels particularly heavy, especially during longer excursions.

September Average Humidity in Penllyn

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

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

Maximum UV Index Levels in Penllyn for September

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

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

This table compares monthly weather conditions in Penllyn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)83 mm (3.3 inches)88%low
February Weather6°C (44°F)111 mm (4.4 inches)88%low
March Weather7°C (45°F)101 mm (4.0 inches)86%moderate
April Weather9°C (49°F)56 mm (2.2 inches)84%high
May Weather12°C (54°F)80 mm (3.2 inches)80%high
June Weather15°C (60°F)85 mm (3.3 inches)80%very high
July Weather17°C (63°F)86 mm (3.4 inches)70%very high
August Weather16°C (62°F)106 mm (4.2 inches)73%high
September Weather15°C (59°F)92 mm (3.6 inches)79%high
October Weather12°C (54°F)146 mm (5.7 inches)89%moderate
November Weather9°C (48°F)111 mm (4.4 inches)90%low
December Weather7°C (45°F)144 mm (5.7 inches)89%low

Compare Penllyn's Climate with Cities Worldwide