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September Weather in Larne, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Larne, United Kingdom stands at a cool 13°C (56°F). Expect temperatures to dip to a minimum of 8°C (46°F) and rise to a comfortable 20°C (68°F). With 95 mm (3.8 in) of precipitation spread over 17 days, it's a month rich in moisture, accompanied by a high average humidity of 88%.

September Temperature in Larne

In September in Larne, the average temperature is 13°C (56°F). Maximum temperatures can reach 20°C (68°F), while minimums can drop to as low as 8°C (46°F). This mild climate makes Larne an ideal destination for travelers seeking pleasant weather.

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

The chart illustrates September temperature patterns in Larne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Larne, September typically has an average temperature of 13°C (56°F), with highs reaching up to 20°C (68°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec434344465055575856524845
Data source: Temperature data for Larne 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 Larne

In Larne in September, the precipitation amount is 95 mm (3.8 in) over the course of 17 days.

September Precipitation Trends in Larne

The chart displays monthly precipitation patterns in Larne, 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 Larne, September typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec781119445699310812995125129118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Larne

In Larne in September, humidity is 88%. With an average temperature of 13°C (56°F), this humidity feels like a thick, warm blanket wrapping around you, making outdoor adventures sticky and challenging.

September Average Humidity in Larne

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

In Larne 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 Larne.

Maximum UV Index Levels in Larne for September

The chart shows the monthly maximum UV Index (UVI) for Larne 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 Larne typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
Data source: Larne 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 Larne Compares to Other Months

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

This table compares monthly weather conditions in Larne, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)78 mm (3.1 inches)87%low
February Weather6°C (43°F)111 mm (4.4 inches)86%low
March Weather7°C (44°F)94 mm (3.7 inches)86%moderate
April Weather8°C (47°F)45 mm (1.8 inches)85%moderate
May Weather10°C (51°F)69 mm (2.7 inches)82%high
June Weather13°C (55°F)93 mm (3.7 inches)84%very high
July Weather14°C (58°F)108 mm (4.2 inches)86%very high
August Weather14°C (58°F)129 mm (5.1 inches)86%high
September Weather13°C (56°F)95 mm (3.8 inches)88%moderate
October Weather11°C (53°F)125 mm (4.9 inches)89%moderate
November Weather9°C (48°F)128 mm (5.1 inches)90%low
December Weather7°C (45°F)118 mm (4.7 inches)86%low

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