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September Weather in Ystalyfera, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Ystalyfera, United Kingdom hovers around 13°C (56°F). Expect chilly lows plummeting to 1°C (35°F), while highs can reach a pleasant 27°C (82°F). Prepare for 14 days of potential rainfall, accumulating around 110 mm (4.3 in), and embrace the atmosphere with an average humidity of 79%.

September Temperature in Ystalyfera

In September in Ystalyfera, the average temperature is 13°C (56°F). Maximums can reach 27°C (82°F), and minimums can be as low as 1°C (35°F). Be prepared for a range of temperatures, making it wise to pack layers for your travels.

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

The chart illustrates September temperature patterns in Ystalyfera, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ystalyfera, September typically has an average temperature of 13°C (56°F), with highs reaching up to 27°C (82°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec404243475258616056514543
Data source: Temperature data for Ystalyfera 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 Ystalyfera

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

September Precipitation Trends in Ystalyfera

The chart displays monthly precipitation patterns in Ystalyfera, 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 Ystalyfera, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec10015312968107103107139110168135170
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ystalyfera

In Ystalyfera 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 Ystalyfera

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

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

Maximum UV Index Levels in Ystalyfera for September

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

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

This table compares monthly weather conditions in Ystalyfera, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)100 mm (4.0 inches)88%low
February Weather5°C (42°F)153 mm (6.0 inches)88%low
March Weather6°C (44°F)129 mm (5.1 inches)86%moderate
April Weather9°C (48°F)68 mm (2.7 inches)84%high
May Weather11°C (53°F)107 mm (4.2 inches)80%high
June Weather15°C (58°F)103 mm (4.1 inches)80%very high
July Weather16°C (61°F)107 mm (4.2 inches)70%very high
August Weather15°C (60°F)139 mm (5.5 inches)73%high
September Weather13°C (56°F)110 mm (4.3 inches)79%high
October Weather11°C (51°F)168 mm (6.6 inches)89%moderate
November Weather7°C (46°F)135 mm (5.3 inches)90%low
December Weather6°C (43°F)170 mm (6.7 inches)89%low

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