Weather in Donegal

Stay up to date with the current weather situation in Donegal. Below, you will find the latest data, forecasts, and visual charts to help you successfully plan your trip.

The climate of Donegal can be described as temperate maritime, heavily influenced by the Atlantic Ocean. Due to this location, extreme temperature fluctuations are non-existent: the weather remains relatively mild and humid throughout the year. The air here is always fresh, and severe frosts or scorching heat are rare occurrences in this region of Ireland.

The seasons transition smoothly. Summer in Donegal is cool and refreshing, with average temperatures around 13–14 °C and highs rarely exceeding 17 °C. Winter is mild, with the thermometer typically hovering between 5–8 °C. This stability makes the town accessible to visitors all year round, although tourists should be mindful of the high likelihood of rainfall.

A defining feature of the local weather is frequent rain: the number of rainy days remains high in any given month, ranging from 16 to 23 days. Therefore, when packing for your trip, it is essential to bring an umbrella and a waterproof windbreaker. It is precisely due to this abundance of moisture that the nature surrounding Donegal boasts that famous Irish greenery.

The temperature range in Donegal is characterized by moderation and a lack of extreme fluctuations, typical of Ireland's mild maritime climate. The annual cycle begins with the coolest readings in January, when the average temperature is around 5.1°C. Gradual warming leads to the peak of the summer season in July and August: during these months, the air warms up to an average of 14.3°C, making this the warmest period of the year.

Summer here cannot be described as hot; rather, it is pleasantly fresh and comfortable. Even at the height of the season, in July, maximum daytime temperatures rarely exceed 17.0°C, which is ideal for outdoor activities without the risk of overheating. Winters in Donegal are mild and practically devoid of severe frosts. In January and February, nighttime temperatures generally stay in the range of 3.2°C — 3.5°C, remaining cool but not creating extreme cold.

A characteristic feature of the local climate is the small difference between day and night temperatures throughout the year. Daily fluctuations are usually insignificant, amounting to just a few degrees, which ensures stable conditions. Transitional seasons also pass smoothly: by May, the average temperature reaches 11.0°C, while October retains residual warmth at 10.2°C before giving way to winter chill.

The weather in Donegal perfectly fits the image of the classic Irish climate: precipitation here is a frequent and regular occurrence throughout the year. There is no distinct dry season in this region, so travelers should always carry a reliable umbrella or waterproof jacket. Rain usually falls as a fine drizzle or short showers, which are quickly replaced by clear spells.

According to statistics, spring can tentatively be called the "driest" period. In May and April, the lowest number of rainy days is recorded — averaging between 16 and 17 per month. This time of year is often chosen by those wishing to minimize the chance of getting wet, although it is impossible to completely rule out rain even during this period.

Interestingly, summer does not guarantee an absence of rain. On the contrary, August often turns out to be one of the wettest months of the year: the number of days with precipitation can reach 23. Autumn and early winter are also characterized by high humidity, especially October and December (more than 20 rainy days). In the winter months, precipitation falls primarily as rain, as temperatures rarely drop low enough for stable snow cover.

The weather in Donegal is famous for its changeability, so the golden rule for travelers here is the principle of layering. Even in the summer months, when the air warms up to 14–17°C, cool winds may blow from the Atlantic. Since statistics indicate a high probability of precipitation throughout the year (from 16 to 23 rainy days per month), the most important item in your wardrobe will be a high-quality waterproof and windproof jacket with a hood. An umbrella often proves useless here due to gusty winds, so it is better to rely on a good raincoat.

If you are planning a trip during winter or the off-season, when the temperature hovers around 5–8°C, be sure to bring warm wool sweaters, thermal underwear, a hat, and gloves. In summer, you will need T-shirts and light jumpers that can be easily combined. Despite the frequent cloud cover, do not forget sunglasses and sunscreen: UV radiation near the coast can be active even in cool weather.

Proper footwear is critically important for exploring the picturesque landscapes of Donegal. Opt for comfortable trekking boots or sneakers with water-repellent treatment and non-slip soles, as the grass and paths are often wet. It is also wise to carry a spare pair of dry shoes and warm socks to feel comfortable after long walks in the fresh air.