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September Weather in Dublin, United States

Last updated: June 24, 2025

In September, the average temperature in Dublin, United States is a pleasant 21°C (69°F). Expect a range where minimums can dip to 5°C (41°F) and highs may soar to 33°C (92°F). Be prepared for 90 mm (3.5 in) of precipitation spread over 7 days, and humidity levels around 69% ensure a moist atmosphere.

September Temperature in Dublin

In September in Dublin, the average temperature is 21°C (69°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop to as low as 5°C (41°F). This diverse climate makes Dublin an ideal destination for travelers seeking both warm days and cooler 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 21°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec303442526472767369574136
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 90 mm (3.5 in) over the course of 7 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 90 mm (3.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec7910013310413611811588901009790
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 69%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace, making travel somewhat uncomfortable as the air clings around you, urging you to seek shade and refreshment along your journey.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
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 Weather-1°C (30°F)79 mm (3.1 inches)87%moderate
February Weather1°C (34°F)100 mm (3.9 inches)85%moderate
March Weather6°C (43°F)132 mm (5.2 inches)86%high
April Weather11°C (52°F)104 mm (4.1 inches)84%very high
May Weather18°C (64°F)136 mm (5.4 inches)79%very high
June Weather22°C (73°F)118 mm (4.6 inches)82%extreme
July Weather24°C (76°F)115 mm (4.5 inches)79%very high
August Weather23°C (73°F)88 mm (3.5 inches)70%very high
September Weather21°C (69°F)90 mm (3.5 inches)69%very high
October Weather14°C (58°F)100 mm (3.9 inches)76%high
November Weather5°C (42°F)97 mm (3.8 inches)88%moderate
December Weather2°C (36°F)90 mm (3.5 inches)87%moderate

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