Weather in Nantucket

Planning your day or trip? Find the most up-to-date weather information for Nantucket, including current conditions and detailed forecasts, right here in this section.

The climate of Nantucket can be described as temperate maritime, strongly influenced by the Atlantic Ocean. Thanks to its island location, there is no extreme continental heat or excessively severe frost here. The ocean acts as a natural thermal regulator, smoothing out seasonal fluctuations and creating a mild atmosphere that attracts travellers.

The seasons change smoothly but noticeably. Summer here is delightful: warm but not stifling, with an average temperature of about 21–22°C in July and August, which is ideal for a comfortable holiday on the coast. Winter is cool and humid, with average values slightly above freezing, though severe cold spells are rare. Spring arrives gradually, whilst autumn often pleases with mild weather, as the ocean water still holds the warmth accumulated over the summer.

It is worth noting that the weather on the island can be changeable. Precipitation falls quite regularly throughout the year: even in the "driest" summer months, there are about 8–9 rainy days, and April often becomes the wettest period. A fresh ocean breeze is a constant companion in Nantucket, so even in summer, tourists are advised to have a light windbreaker for evening walks by the water.

The climate of Nantucket is largely determined by its island position, which smooths out temperature fluctuations and makes the weather milder compared to the mainland part of New England. The coldest months of the year are traditionally January and February, when the average air temperature hovers between +1.8°C and +2.8°C. Winters here cannot be called severe: night temperatures only slightly drop below freezing (to -0.5°C), whilst during the day the air warms up to +4...+5°C. This time of year is characterised by coolness and freshness, but without extreme frosts.

The summer season on the island offers tourists exceptionally comfortable conditions, ideal for those who wish to avoid exhausting heat. The warmest month is August with an average reading of +21.9°C. In July and August, daytime highs rarely exceed +23°C, creating an atmosphere of pleasant, gentle warmth. Such weather favours long walks and relaxation on the coast, allowing you to enjoy the sun without the risk of overheating.

An interesting feature of Nantucket's temperature regime is the surprising stability of daily temperatures. According to statistics, the difference between daytime highs and nighttime lows here is minimal — often it is only 1–2 degrees, especially during the summer period. This means that nights on the island remain almost as warm as the days. Furthermore, the ocean retains heat for a long time, so September (average temperature +19°C) is significantly warmer here than June (+16.7°C), making the beginning of autumn a wonderful time for a visit.

Precipitation in Nantucket is distributed relatively evenly throughout the year, yet travellers have an excellent opportunity to choose the most comfortable season. Thanks to the influence of the ocean, there is no extreme drought here, but summer clearly stands out as the driest and sunniest period, ideal for beach holidays and exploring the island.

In winter, especially in January and February, when temperatures often drop to freezing points and below, precipitation may fall as snow or sleet. Spring is characterised by frequent rains: the gloomiest month according to statistics is April, when up to 16 rainy days are recorded. At this time of year, the weather is changeable, and tourists are strongly advised to carry a reliable umbrella or raincoat.

Summer months, on the contrary, delight with greater stability. July and August are the driest times of the year, when the number of days with precipitation decreases to 8–9 per month, and their volume is minimal (about 2–3 mm). In autumn, humidity gradually returns: October becomes the leader in the total volume of rainfall (6 mm), although the air temperature still remains comfortable enough for visiting this picturesque corner of the United States.

Given the maritime climate of Nantucket, the weather here can be changeable, so the principle of layering your clothing will become your main rule when packing. In summer, when the average temperature holds at a comfortable mark of 21–22°C, the ocean breeze brings freshness, so evenings can be cool. Besides light t-shirts, shorts, and swimwear, be sure to pack a warm sweater, hoodie, or windbreaker to feel cosy during walks along the waterfront or dinners at sunset.

If your trip is planned for late autumn or winter, when the temperature drops to 2–4°C, you will need a warm windproof jacket, scarf, gloves, and a hat. Due to high humidity and winds, the cold can feel sharper, so thermal underwear will not be amiss. Precipitation falls evenly throughout the year, so a compact umbrella or a high-quality raincoat is a mandatory item in your luggage in any season, especially in spring and autumn.

Pay special attention to footwear: for exploring the historic centre with its cobblestones and walking along nature trails, comfortable trainers or soft flat moccasins are ideal. In the summer months, the sun by the water can be active, so do not forget sunscreen and sunglasses. A spacious backpack will also come in handy to carry water and those extra layers of clothing in case of a sudden change in weather.