September Weather in Birr, Ireland

Last updated: August 23, 2025

In September, the average temperature in Birr, Ireland hovers around 13°C (56°F), with a comfortable range that sees a minimum of 2°C (35°F) and a maximum of 26°C (79°F). Expect 75 mm (3.0 in) of precipitation spread over 14 days, contributing to a notably high average humidity of 88%. 🌧️

September Temperature in Birr

In September in Birr, the average temperature is 13°C (56°F). Maximums can reach 26°C (79°F) and minimums can be as low as 2°C (35°F). This variation in temperature makes Birr a great destination for travelers looking to experience mild weather and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Birr, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Birr, September typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (79°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in Birr

In Birr in September, the precipitation amount is 75 mm (3.0 in) spread over 14 days, indicating a relatively wet period for the region.

September Precipitation Trends in Birr

The chart displays monthly precipitation patterns in Birr, 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 Birr, September typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 14 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 Birr

In Birr 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 Birr

This chart illustrates the average monthly humidity levels in Birr, 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 Birr is approximately 88%, 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 Birr

In Birr 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 Birr.

Maximum UV Index Levels in Birr for September

The chart shows the monthly maximum UV Index (UVI) for Birr 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 Birr typically reaches 5, which falls under the moderate exposure category.

Data source: Birr 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 Birr Compares to Other Months

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

This table compares monthly weather conditions in Birr, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (42°F)	62 mm (2.4 inches)	88%	low
February Weather	6°C (43°F)	103 mm (4.0 inches)	88%	low
March Weather	7°C (44°F)	94 mm (3.7 inches)	87%	moderate
April Weather	9°C (48°F)	54 mm (2.1 inches)	86%	moderate
May Weather	11°C (53°F)	66 mm (2.6 inches)	83%	high
June Weather	14°C (58°F)	69 mm (2.7 inches)	83%	very high
July Weather	16°C (61°F)	74 mm (2.9 inches)	85%	very high
August Weather	15°C (59°F)	103 mm (4.0 inches)	85%	high
September Weather	13°C (56°F)	75 mm (3.0 inches)	88%	moderate
October Weather	10°C (51°F)	90 mm (3.5 inches)	91%	moderate
November Weather	8°C (46°F)	88 mm (3.5 inches)	92%	low
December Weather	6°C (44°F)	104 mm (4.1 inches)	89%	low