Pollen count in Letterkenny today

Letterkenny usually follows the Donegal forecast closely, but some days differ, so it has its own forecast. In 2026 it had 16 High or Very high days, against 15 in the Donegal forecast.

Hay fever symptoms in Letterkenny are influenced by the county's hilly terrain and coastal location. Ireland's most exposed county has naturally low pollen levels due to constant Atlantic winds. However, the blanket bogs and mountains support significant heather and moorland plants. Common symptoms include sneezing, runny or blocked nose, itchy and watery eyes, and an itchy throat. The frequent rainfall can provide some relief, though humid conditions may support mould spores. The rural setting means exposure to agricultural pollen sources is common during farming activities.

Tree pollen season typically starts slightly later in Ulster, running from late February to May. In Letterkenny, the key local trees are birch, rowan, willow, which affect spring pollen levels. Grass pollen season peaks in June and July, with the Atlantic cliffs and Derryveagh Mountains contributing to local concentrations. Weed pollen, including nettle and dock, can be present from June to September. Our daily forecasts help you track these changing conditions throughout the seasons.

Donegal receives Ireland's highest rainfall and strongest winds, which keeps airborne pollen levels consistently lower than sheltered counties. Sea breezes along the coast can help disperse pollen, making coastal areas preferable during high pollen days. Warm, dry, and windy days typically see higher pollen counts as conditions favour pollen release and dispersal. The regular rainfall in Letterkenny often provides natural relief by washing pollen from the air.

Yes, rain generally reduces airborne pollen levels in Letterkenny by washing particles from the air. The county's frequent rainfall means you'll often get natural pollen relief, though humidity can increase mould spore levels in areas like Atlantic cliffs. However, thunderstorms can break pollen grains into smaller particles that penetrate deeper into the lungs. Light, steady rain is best for pollen relief. Check our daily forecast to plan activities around weather patterns.

The dramatic coastline from Malin Head to Slieve League offers some of Ireland's cleanest air. Ideal for hay fever sufferers seeking an outdoor escape during peak season. General tips include checking our daily pollen forecast before planning outdoor activities, staying indoors during peak pollen times (usually mid-morning and early evening), wearing wraparound sunglasses outdoors, and showering after being outside. The coastal areas of Letterkenny typically have lower pollen levels, especially when sea breezes are blowing. Consult your pharmacist or GP about antihistamines and other treatments tailored to your symptoms.