On an expedition cruise to Antarctica you might sail through a glassy bay under a midnight sun one day, then need to rug up in the cosy ship lounge waiting out a snow squall the next. Other times, you might also step ashore in a drizzle that feels more like Tasmania than the end of the Earth.
As unpredictable as the landscape, Antarctica’s weather is all part of the adventure. Travel prepared, with plenty of layers and an open mind, and you’ll experience a destination unlike any other on earth.
Antarctica’s cruise season: when the weather lets you in
Antarctica’s expedition cruise season follows the southern summer. Ships cruise from October to April, with most voyages concentrated between November and March. Outside that window, sea ice, darkness and severe storms make the region inaccessible to passenger ships.
For Australians, the timing is easy to remember: the Antarctic summer is our summer too. As the days lengthen in Sydney, Melbourne and Hobart, they’re also stretching out across the Southern Ocean. By December the sun barely dips below the horizon on the southern parts of the Antarctic Peninsula. This is the land of the midnight sun.
Each part of the season has its own character:
- Early season (October–November): Cold, crisp and snow-covered, with the most pristine landscapes. Sea ice is still breaking up, which can limit how far south ships can go. Penguins are arriving to nest.
- Mid-season (December–January): The warmest temperatures, the longest days and the most stable conditions. Penguin eggs are hatching, and the snow starts to melt back from the rocks.
- Late season (February–March): Slightly cooler and often a touch windier, with a good chance of whale sightings. Penguin chicks are fledging, the light turns golden, and sunsets and sunrises return.
- Shoulder months (October and April): Fewer voyages, colder conditions and more changeable weather, but also fewer people and dramatic light.
Antarctica cruises, though, cover a vast distance. Stretching well over 1,000km from the departure ports at the tip of South America to the Weddell Sea. In between sit multiple micro-climates, all with their own ranges in temperature and precipitation.
Falkland Islands weather
Falkland Islands weather is often a pleasant surprise for Antarctica-bound travellers. They sit at about 51°S, roughly the same distance from the equator as Britain is in the north. Summers on the islands can be mild, with daytime highs typically around 12-15°C in Stanley and overnight lows of 4-6°C.
The islands are windy more than they are wet. Westerly winds blow nearly year-round, and they’re the main thing you’ll notice. The rainfall is surprisingly modest, similar to a dry corner of the UK, but showers can blow through quickly. Locals describe having four seasons in one day, and they’re not exaggerating.
On a cruise, the Falklands are usually the first taste of the South Atlantic. Plan on layers, a windproof shell and sunglasses, because bright sunshine can show up between squalls. The reward is spectacular wildlife, including five species of penguin, black-browed albatross colonies and sweeping white beaches.
Find out more about the Falkland Islands
King penguins on the shoreline of South Georgia, seen from a Zodiac / Sean De Freitas
South Georgia weather
South Georgia sits at about 54°S, which gives it a sub-Antarctic climate. It’s a maritime climate, with cool summers and moderately cold winters. Typical summer temperatures on the coast range from around 0°C-10°C, while the average sits a few degrees above freezing.
The island’s weather is driven by steep mountains meeting strong westerly winds. That can mean:
- Changeable skies: Sunshine, cloud, drizzle and snow showers can all appear within an hour.
- Strong, gusty winds: Katabatic gusts (known as williwaws) can sweep down from the mountains into bays, sometimes changing landing plans.
- Foehn warmth: Occasionally, air spilling over the mountains warms and dries as it descends, bringing surprisingly mild days on the northern coast.
- Snow and rain on the highlands: The mountain peaks hold glaciers year-round, while the coastal areas can be green and tussock-covered in summer.
Most voyages visit in November through March, and the weather shapes the calendar. Early in the season (November), snow often still covers parts of the shore and king penguin colonies look dramatic against it. By January and February, the beaches are busy with elephant seals and fur seal pups, and the days are long and mild.
Find out more about South Georgia Island
Sub-Antarctic Islands weather
The sub-Antarctic islands include Macquarie Island, the Auckland and Campbell Islands, the Snares, the Antipodes and several others in the Southern Ocean. They lie in the roaring latitudes, and the climate is cool, cloudy, wet and windy rather than icy.
Temperatures stay fairly steady through the year, typically between about 3°C-10°C in summer, and they rarely fall far below freezing at sea level. Cloud, drizzle and strong winds are common, and some of these islands see rain or showers on most days of the year. Sunshine is a bonus, not an expectation.
The upside is the wildlife. Albatrosses, royal and rockhopper penguins, giant petrels and elephant seals all thrive in this stormy environment. Come prepared with waterproof layers, and treat any clear spell as a gift.
South Shetland Islands weather
The South Shetland Islands lie off the northern tip of the Antarctic Peninsula, and they’re often where voyages make their first Antarctic landing. Summer temperatures hover around freezing, generally from about −2°C-5°C.
This region is one of the milder and wetter parts of the continent’s surroundings. Rain is a real possibility in summer, as are drizzle, sleet and thick fog. Winds can be strong. Overcast days are common, but the cloud often lifts to reveal rugged volcanic landscapes, glaciers and colonies of chinstrap and gentoo penguins. Deception Island’s flooded volcanic caldera is a highlight, and even its weather is unpredictable.
Antarctic Peninsula weather
The Antarctic Peninsula is the most visited part of the frozen continent, and it’s also the mildest. It reaches north toward South America, and its western coast is moderated by the ocean. In summer, daytime temperatures typically range from about −5°C-5°C. The warmest days can feel pleasant in the sun, especially if the wind drops.
What to expect:
- Long daylight: In December and January, there’s up to 20 hours of daylight at most Peninsula latitudes, and near-continuous daylight around the Antarctic Circle. Twilight rather than true darkness is the norm.
- Changeable conditions: Calm, mirror-like bays can give way to wind and snow within hours. Fog and cloud are common, but they can lift quickly.
- Wind chill: The wind is the biggest factor in how cold it feels. A still day at 0°C feels mild, while a 40-knot gust can feel like −15°C.
- Strong light: Reflection off snow and ice means sunburn and snow blindness are real risks. Sunglasses and sunscreen matter.
Among the bays, channels and icebergs, many travellers find the Peninsula’s weather more gentle than they feared.
Find out more about the Antarctic Peninsula
Weddell Sea weather
The Weddell Sea lies on the eastern side of the Peninsula, and it’s a different world. A clockwise current carries pack ice up from the south, so it tends to be colder and icier than the western coast. Summer temperatures are typically around −10°C to 0°C, and the sea can be packed with huge tabular icebergs.
Ice conditions are the main weather-related factor. Heavy sea ice can limit where a ship can go, but it also creates unique opportunities, including the chance to see emperor penguins at Snow Hill Island and Atka Bay in good years. Expect crisp, clear days alternating with fog and snow. Itineraries are flexible by necessity, so the captain and expedition leader will adapt to whatever the ice allows.
Find out more about the Weddell Sea
Ross Sea weather
The Ross Sea is on the opposite side of the continent, and ships usually reach it from Hobart or New Zealand. It’s a true polar environment, with expansive ice shelves, towering volcanoes and historic huts left by the early explorers.
Summer temperatures typically range from around −10°C to +2°C on the coast, depending on wind and location. The air is generally drier and colder than on the Peninsula, with less rain and more crisp, bright weather, but strong winds and sudden storms can still blow in. The season is shorter, running from roughly late December to February, when the sea ice has opened enough for ships to enter. The light is spectacular, with near-continuous sun in midsummer.
Find out more about the Ross Sea