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September Weather in Gilwern, United Kingdom

Last updated: August 27, 2025

In Gilwern, United Kingdom, the average temperature in September is a comfortable 14°C (57°F). Visitors can expect a minimum of 3°C (37°F) and a pleasant maximum of 28°C (83°F). During this time, precipitation averages about 63 mm (2.5 in) over 10 days, contributing to an average humidity of 79%.

September Temperature in Gilwern

In September in Gilwern, the average temperature is 14°C (57°F). Maximums can reach 28°C (83°F), while minimums can drop as low as 3°C (37°F). This variation makes it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Gilwern, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gilwern, September typically has an average temperature of 14°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414244485359636157524643
Data source: Temperature data for Gilwern 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 Gilwern

In Gilwern in September, the precipitation amount is 63 mm (2.5 in) over a span of 10 days.

September Precipitation Trends in Gilwern

The chart displays monthly precipitation patterns in Gilwern, 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 Gilwern, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec61848858798273846311184108
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Gilwern

In Gilwern in September humidity is 79%. With an average temperature of 14°C (57°F), this humidity feels like a warm, sticky embrace that can make even short strolls feel exhausting, creating a sense of heaviness in the air that might dampen your adventurous spirit while exploring.

September Average Humidity in Gilwern

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

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

Maximum UV Index Levels in Gilwern for September

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

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

This table compares monthly weather conditions in Gilwern, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)61 mm (2.4 inches)88%low
February Weather6°C (42°F)84 mm (3.3 inches)88%low
March Weather7°C (44°F)88 mm (3.5 inches)86%moderate
April Weather9°C (48°F)58 mm (2.3 inches)84%high
May Weather12°C (53°F)79 mm (3.1 inches)80%high
June Weather15°C (60°F)82 mm (3.2 inches)80%very high
July Weather17°C (63°F)73 mm (2.9 inches)70%very high
August Weather16°C (61°F)84 mm (3.3 inches)73%high
September Weather14°C (57°F)63 mm (2.5 inches)79%high
October Weather11°C (52°F)111 mm (4.4 inches)89%moderate
November Weather8°C (46°F)84 mm (3.3 inches)90%low
December Weather6°C (43°F)108 mm (4.3 inches)89%low

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