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September Weather in Holywell, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Holywell, United Kingdom is a mild 14°C (57°F). Expect a minimum of 3°C (37°F) and a maximum of 27°C (81°F). During this period, the region sees an average precipitation of 94 mm (3.7 in) spread over 14 days, accompanied by a high average humidity of 85%.

September Temperature in Holywell

In September, in Holywell, the average temperature is 14°C (57°F). Maximum temperatures can reach 27°C (81°F), while minimums can drop as low as 3°C (37°F). This pleasant variability makes it an ideal time for travelers to explore the outdoor attractions and enjoy the local scenery.

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

The chart illustrates September temperature patterns in Holywell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Holywell, 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 (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec424345485459626157524643
Data source: Temperature data for Holywell 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 Holywell

In Holywell in September, the precipitation amount is 94 mm (3.7 in) recorded over the course of 14 days.

September Precipitation Trends in Holywell

The chart displays monthly precipitation patterns in Holywell, 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 Holywell, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec6577845368949698949478101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Holywell

In Holywell 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 Holywell

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

In Holywell 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 Holywell.

Maximum UV Index Levels in Holywell for September

The chart shows the monthly maximum UV Index (UVI) for Holywell 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 Holywell typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875421
Data source: Holywell 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 Holywell Compares to Other Months

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

This table compares monthly weather conditions in Holywell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)65 mm (2.6 inches)89%low
February Weather6°C (43°F)77 mm (3.0 inches)88%low
March Weather7°C (45°F)84 mm (3.3 inches)86%moderate
April Weather9°C (48°F)53 mm (2.1 inches)84%moderate
May Weather12°C (54°F)68 mm (2.7 inches)79%high
June Weather15°C (60°F)94 mm (3.7 inches)81%very high
July Weather17°C (62°F)96 mm (3.8 inches)78%very high
August Weather16°C (61°F)98 mm (3.9 inches)79%high
September Weather14°C (57°F)94 mm (3.7 inches)85%moderate
October Weather11°C (52°F)94 mm (3.7 inches)90%moderate
November Weather8°C (47°F)78 mm (3.1 inches)91%low
December Weather6°C (44°F)100 mm (4.0 inches)89%low

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