Weather in St Peter Port

Going for a walk or planning your day in St Peter Port? In this section, you will find the most up-to-date information on weather conditions, as well as detailed forecasts and useful charts.

The climate in St Peter Port, located in Guernsey, can be characterised as temperate maritime. This means that there are no extreme temperatures here, and the weather is generally mild throughout the year. The influence of the Atlantic Ocean softens both winter cold and summer heat, creating comfortable conditions for visiting at any time of the year.

There are four clearly defined seasons in St Peter Port. Winters are generally mild, with average temperatures around 8-10°C, but with a large number of rainy days – especially in November, December, and January. Spring brings gradual warming and a decrease in precipitation. Summer is the warmest and sunniest time of the year, with average temperatures around 15-18°C and the least amount of rainfall, particularly in July. Autumn is characterised by a gradual drop in temperature and an increase in rainy days, preparing the town for winter.

One of the notable features of the weather in St Peter Port is the relatively high humidity and a significant number of overcast and rainy days, especially during the autumn-winter period. Summer months, conversely, offer more sunshine and are the driest. Annual precipitation is distributed unevenly, peaking during the cold season.

St Peter Port experiences a moderate temperature regime throughout the year, without sharp extreme fluctuations. The coldest months are January and February. In January, the average temperature is 8.6°C, with minimum nightly readings around 7.5°C and maximum daily highs up to 9.6°C. February is very similar, with an average temperature of 8.7°C. The warmest month is traditionally considered to be August, when the average temperature reaches 17.6°C. In August, daytime highs can rise to 18.6°C, and nightly lows rarely drop below 16.6°C. July also delights with warm weather, boasting an average temperature of 17.0°C.

The summer period in St Peter Port, which lasts from June to August, is characterised by pleasantly warm weather. In June, the average temperature holds at the 15.1°C mark, gradually rising towards August values. Daytime temperatures in summer usually fluctuate in the range of 16-19°C, creating comfortable conditions for outdoor activities and sightseeing without exhausting heat. This time of year is ideal for those who prefer moderate warmth.

Winter in St Peter Port, covering December, January, and February, is distinguished by being mild and cool. Average temperatures during these months vary from 8.6°C in January to 9.9°C in December. Severe frosts are uncharacteristic for this region, and even nighttime temperatures generally remain above freezing, dropping on average to 7.5-8.9°C. It is important to note that daily temperature fluctuations in St Peter Port throughout the year are small: the difference between average minimum and maximum daily temperatures is usually only about 2-2.5°C. This contributes to stable weather conditions without sudden changes during the day.

Precipitation in St Peter Port falls throughout the year, however, its intensity and frequency vary noticeably depending on the season. The town does not experience a pronounced dry period, but wetter and drier months can be distinguished. The main form of precipitation is rain, and given the moderate temperatures, snowfall is unlikely here.

The wettest period in St Peter Port falls in late autumn and winter. The rainiest months by amount of precipitation are November and December, when an average of 5 mm falls. December also leads in the number of days with precipitation — there are about 21 of them. January and October follow closely behind, recording 4 mm of precipitation and approximately 18 rainy days each. In these months, rains are generally frequent, but judging by the total volume, they may not be too intense, appearing more often as prolonged drizzle or moderate showers.

A drier season is observed from late spring and throughout the summer. The least amount of precipitation falls in May and July — just 1 mm each. July is also the month with the fewest rainy days, averaging about 8. In May and June, the number of days with precipitation is approximately 9. Despite these months being considered the driest, the probability of rain still remains, so light waterproof clothing may be useful even in summer.

When planning a trip to St Peter Port, it is important to consider its temperate maritime climate with frequent precipitation and windy weather, especially in the off-season and winter. A key principle when packing your suitcase should be layering, allowing you to adapt to changing conditions. Be sure to bring comfortable waterproof shoes for walking on cobbled streets, as there are quite a few rainy days throughout the year. Also indispensable will be a windproof and waterproof jacket or a high-quality raincoat and umbrella. Even in the summer months, a light sweater, cardigan, or fleece jacket will come in handy for evening walks or in case of a cool day when a fresh sea breeze is blowing.

In the summer months (June-August), when the temperature is most comfortable, around 15-18°C, the basis of your wardrobe can consist of T-shirts, light trousers, shorts, or dresses. Don't forget sunscreen and a hat, as the sun can be active. However, given the likelihood of precipitation even in summer, a light waterproof jacket will not be amiss. With the arrival of autumn and especially in winter (from November to March), when average temperatures drop to 8-10°C and the number of rainy days is at its maximum, you will need warmer items: sweaters, warm trousers, possibly thermal underwear, as well as a hat, scarf, and gloves. In spring, the weather gradually improves, but the principle of layering and readiness for rain remain relevant.