Letterkenny

What is the climate like in Letterkenny?

The best time to visit Letterkenny is typically May, the year's most comfortable month (5.3/10). Letterkenny is warmest in August, when daily highs average 63°F (17°C), and coolest in January, when lows fall to about 39°F (4°C). The wettest month is typically August and the driest is April; the year sees roughly 50 in (1271 mm) of precipitation.

• Best time to visitMay — the year's comfort peak (5.3/10)
• Warmest monthAugust — average high 63°F (17°C)
• Coolest monthJanuary — average low 39°F (4°C)
• Wettest monthAugust (5.1 in (129 mm))
• Driest monthApril (3.2 in (81 mm))
• Annual precipitation50 in (1271 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromMalin Head, 53 km away (1929-2026)