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September Weather in Dublin, United States

Last updated: June 24, 2025

In September, the average temperature in Dublin, United States hovers around 20°C (67°F). Visitors can expect a range from a chilly 3°C (38°F) to a warm 32°C (89°F). Precipitation is moderate, with about 95 mm (3.7 in) falling over 9 days, while the average humidity sits at a comfortable 68%.

September Temperature in Dublin

In September in Dublin, the average temperature is 20°C (67°F). Maximum temperatures can reach 32°C (89°F), while the minimum can dip as low as 3°C (38°F). This diverse temperature range makes Dublin an ideal destination for travelers seeking a mix of warm days and cool evenings.

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

The chart illustrates September temperature patterns in Dublin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dublin, September typically has an average temperature of 20°C (67°F), with highs reaching up to 32°C (89°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec354145546369737267584440
Data source: Temperature data for Dublin 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 Dublin

In Dublin in September, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in Dublin

The chart displays monthly precipitation patterns in Dublin, 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 Dublin, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec661058410510285618695976287
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dublin

In Dublin in September humidity is 68%. With an average temperature of 20°C (67°F), this humidity feels like walking through a warm, heavy blanket, making travel a bit sweltering and causing you to crave frequent breaks in the shade.

September Average Humidity in Dublin

This chart illustrates the average monthly humidity levels in Dublin, 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 Dublin is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Dublin

In Dublin in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Dublin.

Maximum UV Index Levels in Dublin for September

The chart shows the monthly maximum UV Index (UVI) for Dublin 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 Dublin typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010753
Data source: Dublin 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 Dublin Compares to Other Months

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

This table compares monthly weather conditions in Dublin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)66 mm (2.6 inches)87%moderate
February Weather5°C (41°F)105 mm (4.1 inches)87%high
March Weather7°C (46°F)84 mm (3.3 inches)86%very high
April Weather12°C (54°F)105 mm (4.1 inches)84%very high
May Weather17°C (63°F)102 mm (4.0 inches)83%extreme
June Weather21°C (69°F)85 mm (3.3 inches)83%extreme
July Weather23°C (74°F)61 mm (2.4 inches)79%extreme
August Weather22°C (72°F)86 mm (3.4 inches)66%very high
September Weather20°C (67°F)95 mm (3.7 inches)68%very high
October Weather14°C (58°F)97 mm (3.8 inches)78%high
November Weather6°C (44°F)61 mm (2.4 inches)89%moderate
December Weather4°C (40°F)87 mm (3.4 inches)86%moderate

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