September Weather in Dublin, United States

Last updated: June 24, 2025

In September, the average temperature in Dublin, United States hovers around 26°C (79°F). Expect a range from a cool 13°C (55°F) to a sizzling 38°C (102°F). During this time, the area experiences about 107 mm (4.2 in) of precipitation spread over 9 days, contributing to an average humidity level of 82%.

September Temperature in Dublin

In September in Dublin, the average temperature is 26°C (79°F). Maximums can reach 38°C (102°F), and minimums can drop to as low as 13°C (55°F). Travelers should prepare for warm days and cooler nights while exploring this vibrant destination.

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 26°C (79°F), with highs reaching up to 38°C (102°F) and lows dropping to around 13°C (55°F).

Data source: Temperature data for Dublin generated using information from the Copernicus Climate Change Service.

September Precipitation in Dublin

In Dublin in September, the precipitation amount is 107 mm (4.2 in), occurring over a span 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 107 mm (4.2 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Dublin

In Dublin in September, humidity is 82%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket that envelops you, making outdoor activities feel more taxing and requiring frequent breaks to stay hydrated.

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 82%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	92 mm (3.6 inches)	86%	moderate
February Weather	13°C (56°F)	116 mm (4.6 inches)	84%	high
March Weather	16°C (61°F)	74 mm (2.9 inches)	83%	very high
April Weather	19°C (67°F)	89 mm (3.5 inches)	81%	very high
May Weather	24°C (76°F)	86 mm (3.4 inches)	81%	extreme
June Weather	27°C (80°F)	108 mm (4.2 inches)	81%	extreme
July Weather	28°C (83°F)	105 mm (4.1 inches)	83%	extreme
August Weather	28°C (83°F)	99 mm (3.9 inches)	81%	extreme
September Weather	26°C (79°F)	107 mm (4.2 inches)	82%	very high
October Weather	22°C (71°F)	91 mm (3.6 inches)	78%	very high
November Weather	14°C (57°F)	58 mm (2.3 inches)	86%	high
December Weather	11°C (53°F)	121 mm (4.8 inches)	89%	moderate