Letterkenny is a city of approximately 19,300 people in Ulster, Ireland. Located in the GMT/IST time zone at 55°N latitude.
In 2025, Letterkenny averaged an annual temperature of 50°F, with hottest temperatures reaching 83°F in July and lowest around 22°F in January. The city received approximately 44 inches of precipitation during the year.
View historical weather for Letterkenny · More cities in Ulster