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September Weather in Killyleagh, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Killyleagh, United Kingdom is a pleasant 14°C (57°F). Expect a minimum of 6°C (43°F) and a maximum of 21°C (70°F), making it ideal for various outdoor activities. However, be prepared for some rain, as the region receives an average precipitation of 82 mm (3.2 in) over 16 days. With an average humidity of 88%, the air can feel a bit muggy, so pack accordingly!

September Temperature in Killyleagh

In September in Killyleagh, the average temperature is 14°C (57°F), with maximums reaching 21°C (70°F) and minimums dropping as low as 6°C (43°F). This mild weather makes it an ideal time for travelers to explore the sights and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Killyleagh, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Killyleagh, September typically has an average temperature of 14°C (57°F), with highs reaching up to 21°C (70°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec434345475256595956524845
Data source: Temperature data for Killyleagh 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 Killyleagh

In Killyleagh in September, the total precipitation amount is 82 mm (3.2 in) distributed over 16 days.

September Precipitation Trends in Killyleagh

The chart displays monthly precipitation patterns in Killyleagh, 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 Killyleagh, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec6698844364819011682107110103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Killyleagh

In Killyleagh in September humidity is 88%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and giving a sense of stickiness that can drain your energy quickly while exploring.

September Average Humidity in Killyleagh

This chart illustrates the average monthly humidity levels in Killyleagh, 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 Killyleagh is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Killyleagh

In Killyleagh 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 Killyleagh.

Maximum UV Index Levels in Killyleagh for September

The chart shows the monthly maximum UV Index (UVI) for Killyleagh 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 Killyleagh typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578865321
Data source: Killyleagh 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 Killyleagh Compares to Other Months

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

This table compares monthly weather conditions in Killyleagh, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)66 mm (2.6 inches)87%low
February Weather6°C (44°F)98 mm (3.8 inches)86%low
March Weather7°C (45°F)84 mm (3.3 inches)86%moderate
April Weather8°C (47°F)43 mm (1.7 inches)85%moderate
May Weather11°C (52°F)64 mm (2.5 inches)82%high
June Weather13°C (57°F)81 mm (3.2 inches)84%very high
July Weather15°C (59°F)89 mm (3.5 inches)86%very high
August Weather15°C (59°F)116 mm (4.6 inches)86%high
September Weather14°C (57°F)82 mm (3.2 inches)88%moderate
October Weather11°C (53°F)107 mm (4.2 inches)89%moderate
November Weather9°C (48°F)110 mm (4.3 inches)90%low
December Weather7°C (45°F)103 mm (4.1 inches)86%low

Compare Killyleagh's Climate with Cities Worldwide