Weather in Леттеркенни by month: what to expect

Леттеркенни sits in the northwest of Ireland, where the weather follows a gentle rhythm rather than dramatic swings. The mildest months—May through September—offer the most comfortable conditions, with average temperatures hovering around +11...+15 °C. Even in these warmer months, the air rarely feels stuffy, thanks to the Atlantic’s moderating influence.

Winter in Леттеркенни is soft by Irish standards, with January and February averaging +6.5 °C. Frost is uncommon, and snow is a rare visitor, though the damp chill can linger. The shoulder seasons, March to April and October to November, bring changeable skies, where a single day might mix sunshine, drizzle, and wind.

Rain is a constant companion in Леттеркенни, but it’s rarely heavy or prolonged. The driest stretch falls in April and May, while December and August see the highest rainfall. Packing for Леттеркенни means preparing for variability—layers and waterproof gear will serve you year-round.

Temperatures in Леттеркенни climb gradually from winter to summer, with July and August marking the warmest period at +14.6...+14.7 °C. Even at its peak, the heat is subdued, making it easy to explore without discomfort. Nights cool off, dropping to around +12 °C in summer, so a light jacket is useful after sunset.

Winter days in Леттеркенни stay above freezing, with January averaging +6.5 °C and rarely dipping below +4 °C. The coldest nights may touch +4.3 °C, but prolonged frost is unusual. Spring arrives slowly, with March still feeling chilly at +7.1 °C, while May brings a noticeable shift to +11.2 °C.

Autumn in Леттеркенни cools steadily, with September at +13.5 °C and November slipping to +8.7 °C. The transition is smooth, without sharp drops, so even late-season visits remain pleasant for outdoor walks. The mildness of Леттеркенни’s climate means no extreme heat or cold—just steady, manageable conditions.

Rainfall in Леттеркенни is spread throughout the year, with no true dry season. The wettest months—December (122.4 mm) and August (120.5 mm)—see frequent but light showers, often interspersed with dry spells. Even in these months, downpours are rare; the rain tends to be persistent rather than intense.

The driest period falls in April (55 mm) and May (60.2 mm), when the weather is most predictable. However, even in these months, a few rainy days are likely. June and July bring moderate rainfall (75.2 mm and 97.6 mm), while October and November see a gradual increase to around 110 mm.

Visitors to Леттеркенни should expect rain at any time, but it’s rarely disruptive. The showers are usually brief, and the landscape thrives on the moisture, staying lush and green year-round. A compact umbrella or waterproof layer is all you’ll need to stay comfortable.

For a trip to Леттеркенни in summer (June to August), pack light layers—think breathable fabrics for daytime and a sweater for cooler evenings. A waterproof jacket is essential, even if the forecast looks dry. Comfortable walking shoes will handle both city streets and countryside paths.

In spring (March to May) and autumn (September to November), layering becomes key. Mornings can be crisp, while afternoons warm up to +10...+14 °C. A mix of long sleeves, a fleece, and a windproof outer layer will cover all bases. Waterproof footwear is a good idea, as trails and parks can be damp.

Winter in Леттеркенни (December to February) calls for warm but not bulky clothing. A insulated jacket, scarf, and gloves will suffice for the mild cold, while waterproof boots will keep you dry during walks. Since indoor heating is common, a light sweater underneath your coat ensures comfort when moving between outdoors and indoors.