Letterkenny Weather & Climate: Best Time to Visit

The weather in Letterkenny changes moderately throughout the year, offering enough variation to appreciate each season. Average daytime temperatures reach a pleasant 19°C (66°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 9°C (48°F).

At night, temperatures range from around 12°C (54°F) in July to 3°C (37°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Letterkenny has a relatively rainy climate with high precipitation levels, averaging 1281 mm (50 in) of rainfall annually. Despite minor fluctuations, Letterkenny enjoys fairly consistent precipitation throughout the year. In December, you can expect around 119 mm (4.7 in) of precipitation, while in April, Letterkenny receives about 91 mm (3.6 in). For more details, please visit our Letterkenny Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Letterkenny can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.3 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine