February to April is the sweet spot. Those three months are the driest of the Caribbean year, the sea is at its clearest, and they sit well clear of hurricane season. December and January come next. Everything from June onwards trades a drier forecast for a quieter, cheaper ship.
What separates one Caribbean month from another isn’t the temperature. It’s rain, seaweed and storms, in that order, and only two of those three come up when people plan a winter sailing.
The Temperature Barely Moves
Bridgetown averages a high of 29.1C in January and 31.0C in September. That’s the entire annual range, under two degrees between the coolest month and the warmest. Overnight lows sit between 23.0C in February and 25.2C in June, so even the cool end of the year is shorts weather after dark.
The sea behaves the same way. It runs at about 26.5C through February and March, reaches 29C by September and October, and averages 27.8C across the year. No month is too cold to swim. The usual northern-hemisphere habit of chasing the warmest weeks doesn’t apply, because you’re choosing between good and good.
Rain Is Where the Months Genuinely Differ
Bridgetown records 40mm of rain in an average March. In October and November it records 175mm. That’s the real month-to-month story, and it’s a gap of more than four times.
Caribbean rainfall arrives in short heavy bursts, often in the afternoon, and then clears. A wet month isn’t a washed-out month. It means more of those bursts, and a lower chance a whole beach day stays dry.
The year runs downhill from November through December at 90mm, January at 60mm and February at 45mm, bottoming out in March. From there it climbs back through April and May at 60mm and 70mm, crosses 100mm in June, and builds steadily to the autumn peak. Caribbean rain tends to arrive as a heavy shower, not a grey day, so even the wet months give you plenty of sun between downpours. What the dry months buy you is a beach day you can plan.
Where Hurricane Season Sits
The Atlantic hurricane season runs from 1 June to 30 November, with the statistical peak on 10 September and most activity between mid-August and mid-October. A February sailing sits outside it entirely. A September sailing sits at the centre of it, which is why the fares are what they are.
Sailing inside the season is a reasonable choice, and a ship is a good way to do it, because it can move. Our guide to cruising in hurricane season sets out how that works, what the line will and won’t do, and where you stand under UK package rules.
Sargassum, the Seasonal Factor Fewer People Plan For
Sargassum is a floating brown seaweed that drifts across the Atlantic and washes up on Caribbean beaches. The University of South Florida tracks it by satellite and publishes a monthly bulletin, which makes it one of the few beach conditions you can check before you sail.
The University of South Florida publishes a free monthly Sargassum outlook bulletin covering the whole Caribbean. It’s a satellite view, not a beach-by-beach forecast, but it tells you whether you’re travelling into a heavy year or a light one.
The pattern holds year to year. It builds through spring, peaks in early summer, then falls away to around November. In 2026 the peak came in June, and USF expects the amount to fall away in most regions until possibly November, with beaching still happening but less heavily than in June and July. 2026 is set to be the second largest sargassum year on record, behind 2025.
A February to April sailing usually lands before the build-up starts. Each year differs enough that the bulletin is worth a look in the weeks before you travel. A ship also gives you something a resort can’t. If one island’s windward beaches are covered, the next island may be clear.
When the UK Ships Are Actually There
For a fly-cruise from Britain the calendar narrows on its own. Caribbean ships reposition north for the northern summer, so the UK winter programmes run roughly autumn to spring. Choosing a month is really a choice inside that window.
P&O Cruises is the clearest worked example. It bases Britannia and Arvia in the Caribbean for the winter, roughly October to March, with Bridgetown the main home port and Arvia also sailing from Antigua. Flights are direct and included in the price.
It isn’t only P&O. Marella crosses from Malaga in early November and sails Voyager, Explorer 2 and Discovery from Bridgetown and from La Romana in the Dominican Republic through to April. Ambassador puts Renaissance in the Caribbean across the same season, sailing from Bridgetown with Virgin Atlantic flights from Heathrow included, and opens with a 25-night crossing from Tilbury at the end of October. Check the ship you want and the month you want together.
Caribbean ships move north for the northern summer, so the UK fly-cruise programme runs across the winter. If you are set on a particular month, check that a ship is actually based there before you build a plan around it.
Those seasons line up with the good weather, which is why February to March is both the driest part of the year and the busiest part of the UK programme. Book it early and you get the weather and a ship sailing from a port you can reach on one flight.
The Months, Ranked by What They Give You
- March: the driest month of the year at 40mm, sea around 26.5C, no storm season, sargassum not yet built. The strongest all-round month
- February: 45mm and the same clear conditions, with the UK programme in full swing. Half-term makes it the busiest of the good months
- April: 60mm and warming, still outside the storm season, with sargassum starting to appear on windward coasts
- December and January: 90mm and 60mm, warm and dry enough, with Christmas and New Year sailings the standout of the calendar
- May: 70mm, the quiet edge of the season, and the last month before the storm window opens
- June to November: the wettest and stormiest stretch, and by some distance the best value. Worth doing with flexible plans and the right insurance
Frequently Asked Questions
March. Bridgetown averages 40mm of rain that month, its lowest of the year, the sea sits around 26.5C, it falls outside hurricane season and sargassum has usually not built to its early-summer level. February is a close second at 45mm, with the UK fly-cruise programme at its busiest.
No. Average highs in Bridgetown range from 29.1C in January to 31.0C in September, a spread of under two degrees across the whole year. Summer is wetter and stormier than winter, not meaningfully hotter.
Rainfall in Bridgetown crosses 100mm in June and peaks at 175mm in October and November, then falls away through December at 90mm to a low of 40mm in March. The rain generally comes as short heavy showers, not all-day cloud.
Yes, and plenty of people do. The season runs 1 June to 30 November with its statistical peak on 10 September. A ship can move away from a system in a way a resort can’t, which is why itineraries change instead of cancelling. Fares are at their lowest across this stretch.
Sargassum builds through spring and peaks in early summer, so the winter and early spring months are usually the clearest. In 2026 the peak fell in June, and the University of South Florida expected amounts to decline until around November. Each year differs in size, so check the bulletin close to sailing.
Across the winter. Caribbean ships reposition north for the northern summer, so the UK programmes run roughly autumn to spring. P&O bases Britannia and Arvia there from about October to March, with Bridgetown the main home port and Arvia also sailing from Antigua. Marella sails Voyager, Explorer 2 and Discovery from Bridgetown and La Romana on a similar calendar, and Ambassador has Renaissance sailing from Bridgetown too. All three include flights.
How We Verify This Advice
We aim for practical, low-risk guidance. Before publishing and during updates, we check core planning details against official sources and current operator information.
What We Check
- Berth and terminal details, including whether the port is walkable or requires a transfer
- Transport options and realistic return timing for different port types
- Details that change frequently, such as fares and schedules, with up-to-date notes where relevant
Typical Sources
- Official port authority and terminal updates
- Cruise line port notes and day-of-call instructions
- Local transport operators and official tourism resources