Climate in Letterkenny

Letterkenny, Ireland has a oceanic climate. The annual average temperature is about 7.8°C and the city receives roughly 1148 mm of precipitation across 192 rainy days a year, with around 700 hours of sunshine. The warmest month is Jul (highs near 17°C) and the coldest is Jan (lows near -1.5°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Letterkenny is classified as Oceanic. This reflects its annual temperature range and the seasonal pattern of its rainfall.

Letterkenny receives about 1148 mm of precipitation a year over roughly 192 rainy days. The wettest month is Dec and the driest is Jun.

Letterkenny sees an estimated 700 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Letterkenny are Jun, Jul, Aug. Conditions vary year to year — verify with a current forecast before booking.

Letterkenny has a climate comfort score of 57/100, a moderate year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.