March Weather in Letterkenny, Ireland

Last updated: August 23, 2025

In Letterkenny, Ireland, the average temperature in March hovers around 6°C (44°F). Expect a chilly minimum of -4°C (25°F) at times, with maximums reaching a pleasant 17°C (63°F). Be prepared for 111 mm (4.4 in) of precipitation spread over 18 days, and note that the air is generally quite humid, with an average humidity of 83%.

March Temperature in Letterkenny

In March in Letterkenny, the average temperature is 6°C (44°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -4°C (25°F). Be prepared for a mix of chilly days and milder weather, making it a great time for layered clothing and exploring the area.

March Weather in Letterkenny: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Letterkenny, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Letterkenny, March typically has an average temperature of 6°C (44°F), with highs reaching up to 17°C (63°F) and lows dropping to around -4°C (25°F).

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

March Precipitation in Letterkenny

In Letterkenny in March, the precipitation amount is 111 mm (4.4 in) over the course of 18 days.

March Precipitation Trends in Letterkenny

The chart displays monthly precipitation patterns in Letterkenny, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Letterkenny, March typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 18 days.

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

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Millimeters (mm) Inches (in)

March Humidity in Letterkenny

In Letterkenny in March, humidity is 83%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and potentially leading to a sense of heaviness in the air.

March Average Humidity in Letterkenny

This chart illustrates the average monthly humidity levels in Letterkenny, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Letterkenny is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Letterkenny

In Letterkenny in March, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Letterkenny for better planning.

Maximum UV Index Levels in Letterkenny for March

The chart shows the monthly maximum UV Index (UVI) for Letterkenny in March, 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 March, the maximum UV index in Letterkenny typically reaches 4, which falls under the moderate exposure category.

Data source: Letterkenny March 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 March Weather in Letterkenny Compares to Other Months

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

This table compares monthly weather conditions in Letterkenny, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	85 mm (3.3 inches)	84%	low
February Weather	6°C (42°F)	123 mm (4.8 inches)	84%	low
March Weather	6°C (44°F)	111 mm (4.4 inches)	83%	moderate
April Weather	8°C (47°F)	59 mm (2.3 inches)	84%	moderate
May Weather	11°C (52°F)	81 mm (3.2 inches)	83%	high
June Weather	13°C (56°F)	102 mm (4.0 inches)	83%	very high
July Weather	15°C (59°F)	98 mm (3.9 inches)	86%	very high
August Weather	14°C (58°F)	146 mm (5.8 inches)	86%	high
September Weather	13°C (55°F)	104 mm (4.1 inches)	87%	moderate
October Weather	10°C (51°F)	124 mm (4.9 inches)	87%	moderate
November Weather	8°C (46°F)	108 mm (4.2 inches)	88%	low
December Weather	6°C (44°F)	124 mm (4.9 inches)	84%	low