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September Weather in Balbriggan, Ireland

Last updated: August 23, 2025

In September, the average temperature in Balbriggan, Ireland hovers around 14°C (57°F). Expect a minimum of 4°C (39°F) and a maximum of 22°C (72°F). Despite the mild temperatures, be prepared for a precipitation amount of 70 mm (2.7 in) over approximately 13 days, along with an average humidity of 86%.

September Temperature in Balbriggan

In September in Balbriggan, the average temperature is 14°C (57°F). Maximums can reach 22°C (72°F), while minimums can drop as low as 4°C (39°F). This mild weather makes Balbriggan an ideal destination for travelers seeking a comfortable climate.

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

The chart illustrates September temperature patterns in Balbriggan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Balbriggan, September typically has an average temperature of 14°C (57°F), with highs reaching up to 22°C (72°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485358616157524745
Data source: Temperature data for Balbriggan 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 Balbriggan

In Balbriggan in September, the precipitation amount is 70 mm (2.7 in) over the course of 13 days.

September Precipitation Trends in Balbriggan

The chart displays monthly precipitation patterns in Balbriggan, 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 Balbriggan, September typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec537373446269739570799385
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Balbriggan

In Balbriggan in September humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.

September Average Humidity in Balbriggan

This chart illustrates the average monthly humidity levels in Balbriggan, 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 Balbriggan is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Balbriggan

In Balbriggan 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 Balbriggan.

Maximum UV Index Levels in Balbriggan for September

The chart shows the monthly maximum UV Index (UVI) for Balbriggan 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 Balbriggan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Balbriggan 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 Balbriggan Compares to Other Months

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

This table compares monthly weather conditions in Balbriggan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)53 mm (2.1 inches)85%low
February Weather7°C (44°F)73 mm (2.9 inches)86%low
March Weather7°C (45°F)73 mm (2.9 inches)86%moderate
April Weather9°C (48°F)44 mm (1.7 inches)85%moderate
May Weather12°C (53°F)62 mm (2.4 inches)83%high
June Weather15°C (58°F)69 mm (2.7 inches)85%very high
July Weather16°C (62°F)73 mm (2.9 inches)86%very high
August Weather16°C (61°F)95 mm (3.7 inches)85%high
September Weather14°C (57°F)70 mm (2.7 inches)86%moderate
October Weather11°C (53°F)79 mm (3.1 inches)87%moderate
November Weather8°C (48°F)93 mm (3.6 inches)86%low
December Weather7°C (45°F)85 mm (3.4 inches)84%low

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