Weather in Alderney

Planning your day? Check the current weather forecast in Alderney to better prepare for your trip. Below you will find the latest data and useful charts for travellers.

The climate of the island of Alderney can be described as temperate maritime, characterised by its mildness and lack of sharp temperature fluctuations. Thanks to the influence of the ocean, there are no severe frosts here in winter, and summer offers a pleasant coolness that provides a refreshing escape from exhausting heat. This makes the island an attractive destination for those who prefer comfortable weather for long walks and exploring nature.

The seasons are quite clearly defined, yet the transition between them is smooth. Summer here is mild and comfortable: in July and August, the air warms up to an average of 17–19°C. Winter is mild, with temperatures rarely dropping below 7°C; however, the cold season accounts for the highest number of overcast days. Spring and autumn delight travellers with gradual temperature changes, remaining within comfortable limits.

An important feature of the local weather is the fairly high frequency of precipitation throughout the year. Even in the driest summer months, one should be prepared for short-term rains, while in winter and late autumn, the number of "wet" days can reach 18–20 per month. Therefore, when planning your trip, be sure to pack a waterproof windbreaker or an umbrella so that the changeable weather does not interfere with your plans.

The temperature regime on the island of Alderney is formed under the strong influence of the ocean, which ensures remarkably smooth temperature trends throughout the year. The concept of seasonal extremes is practically absent here: the annual amplitude is small. The coldest month, January, maintains readings at around 8.2°C, while by August the air warms up on average to 17.6°C, creating conditions of an eternal mild spring or early autumn.

The dynamics of the transitional seasons deserve special attention. Spring arrives gradually: while in March the average temperature is about 8.9°C, by May it rises to 12.4°C. Autumn retains summer warmth for a long time — September, with an average of 16.8°C, is practically on par with the summer months, allowing for comfortable time spent outdoors. A noticeable decline begins only in November, when the thermometer drops to 11.5°C.

A characteristic feature of the local climate is the minimal diurnal temperature fluctuation. The difference between daytime maximums and nighttime minimums is usually only 2–3 degrees. Thanks to this, there are no sharp drops in temperature after sunset on the island, and even in February, average nighttime values are around 7°C.

The climate on the island of Alderney is characterised by moderate humidity throughout the year, which is typical for the Guernsey maritime region. It is difficult to distinguish sharp boundaries between dry and wet seasons here, so travellers should be prepared for precipitation in any month. Rains most often take the form of drizzle or short showers, which, thanks to the winds, can quickly be replaced by clear skies.

The rainiest period falls in late autumn and winter. Statistically, the "wettest" months are November and December, when up to 19–20 days with precipitation are recorded. Rains also occur quite frequently in January and October, so a high-quality raincoat and waterproof footwear will be essential wardrobe elements for a trip during the low season.

With the arrival of spring, the frequency of precipitation decreases noticeably. The period from April to August can be called the driest and most favourable for tourism: on average, there are about 10 rainy days per month. Even if the sky frowns, summer precipitation usually does not last long, allowing you to enjoy walks along the coast.

The climate on the island of Alderney is mild but changeable, so the main principle when packing your suitcase should be layering. Even in summer, there is rarely exhausting heat here, and a fresh breeze often blows from the sea. Bring t-shirts, light jumpers, and fleece jackets that can be easily combined or removed as it gets warmer. Be sure to put a windproof jacket or a light coat in your luggage — they will be useful for coastal walks at any time of the year, protecting you from the winds characteristic of the region.

Since the island is perfect for long hikes and exploring natural beauty, comfortable footwear is your main ally. Give preference to sturdy trainers or trekking boots with flat soles that are suitable for walking on uneven terrain. Given that precipitation in Guernsey is possible in any season (statistics show from 10 to 20 rainy days per month), do not forget a compact umbrella or a quality raincoat. Waterproof shoes will also be an excellent solution to keep your feet dry during sudden rain or morning dew.

If you are planning a trip during the winter months, when the temperature hovers around 8–9°C, add a warm scarf, a hat, and gloves to your list, as high humidity can intensify the feeling of cold. In summer, despite moderate temperatures (averaging up to 17–18°C), the sun can be quite active, so sunscreen and sunglasses are mandatory. Swimwear should be taken if you are travelling in July or August, although the water in the English Channel remains bracing even at the height of the season.