Grenada can be dived every month of the year, and the shops stay open through the seasons. What changes is the wind, the rain, the clarity of the water and, between June and November, the chance that a tropical system disrupts your plans. Knowing the pattern lets you match the month to the kind of diving you want rather than discovering on arrival that the Atlantic-side wrecks are off the table.
The summary is simple: January to May is drier, windier and usually clearer; June to November is warmer, wetter and calmer between weather systems, with hurricane risk peaking from August to October. The detail, month by month, is below, along with what it means for wetsuits, wrecks and Carriacou. Figures for temperature and visibility are typical ranges, not guarantees; any given week can sit outside them.
January to April: dry season, strong trades
Wind. The north-east trade winds are at their most consistent, often blowing 15 to 20 knots, with stronger spells around December and January that locals call the Christmas winds. The west and south-west coasts stay sheltered, but the Atlantic side and the crossing to Carriacou can be rough.
Visibility. Generally the best of the year on the leeward coast, often 20 to 30 metres on good days, because there is little rain to carry sediment off the hills.
Water. The coolest months, around 26 to 27°C. Many divers who are comfortable in a shorty in summer prefer a full 3 mm suit now, particularly on second dives.
What it suits. West-coast reefs, the sculpture park, the Bianca C and the other leeward wrecks. Atlantic-side wrecks run only on calmer days, and humpback whales are occasionally seen passing offshore early in the year. This is also peak visitor season, so book boats and accommodation early.
May and June: the shoulder
Wind eases. The trades soften through May, opening more days for the Atlantic side and smoother crossings to Carriacou.
Rain begins. The wet season usually arrives in June, though early-season showers are often short and heavy rather than all-day rain. Visibility can dip after a downpour and recover within a day or two.
Water warms. Temperatures climb to around 27 to 28°C. Shops are quieter after Easter, and package prices are often lower.
Hurricane season opens on 1 June. Grenada lies near the southern edge of the Atlantic hurricane belt, and early-season storms are uncommon, but Hurricane Beryl in early July 2024 showed that a powerful storm can arrive early. Travel insurance that covers weather cancellations is worth having from June.
July to October: warm, wet and watchful
Warmest water. Temperatures reach 28 to 29°C or a little more by September and October. A thin suit or a rash vest is enough for many divers.
Calm days between systems. With weaker trade winds, the sea can be glassy for days, which is when the Atlantic-side wrecks like the King Mitch become more accessible.
Green water. From late summer, heavy rains over South America send the Orinoco and other river plumes north, and some years they reach Grenada, turning the water greener and reducing visibility, sometimes for weeks. Saharan dust also hazes the sky in summer, though it affects the view above water more than below.
Storms and swell. August to October is the peak of the hurricane season. Even distant systems can send swell that closes sites for a day or two, and a direct threat will close everything. Operators follow the forecast closely and will tell you early if trips are off.
Coral bleaching risk. Unusually warm water late in the year can stress corals. If you see pale or white coral, avoid touching or kicking near it; stressed coral is especially fragile.
November and December: transition
Rains ease. November is often still wet, with rainfall usually tapering off through December.
Hurricane season closes on 30 November. Risk drops sharply after October, though late storms are not impossible.
Trades return. The wind builds again through December, bringing cooler, clearer water and rougher Atlantic conditions. Late November and early December are a good compromise: water still warm, fewer visitors than in January, and visibility improving.
Holiday bookings. Christmas and New Year are busy, and some shops fill their boats weeks ahead.
Visibility recovers. As the rains ease and river plumes fade, the leeward coast usually clears through December. Early in the month a heavy shower can still cloud the bays near river mouths, so keep the clearest offshore sites for days after a dry spell.
What the seasons mean for Carriacou
Carriacou follows the same pattern but feels the wind more, because the sites sit around exposed islets and the island is smaller. In the windy months the ferry crossing from St George's can be rough, and the outer sites such as Sisters Rocks may be dived only on calmer days or at slack tide. Sheltered sites around Sandy Island and Mabouya keep diving going when it blows.
From May to October the sea is generally kinder for the crossing and for the outer rocks, and visibility around the islets is often excellent between rain events. The flip side is that Carriacou took the full force of Hurricane Beryl in July 2024, and a storm threat there means closures and, in the worst case, a disrupted journey home. Divers visiting in the peak storm months should keep the last day or two of the trip on the main island, close to the airport.
What to pack, season by season
Kit decisions follow the water temperature and the sun more than anything else.
- Exposure protection: a 3 mm full wetsuit covers the whole year for most people; in the warmest months a shorty or a long-sleeved rash vest is often enough. Divers who feel the cold should bring 3 mm year-round and a hood or vest for multiple dives.
- Sun protection: boat rides are short but exposed. A hat, sunglasses and a long-sleeved top save more skin than sunscreen, which should be reef-safe in any case.
- Rain jacket: a light waterproof is useful from June to November for the boat ride home after a squall.
- Seasickness tablets: worth having in the windier months, particularly for the Carriacou crossing and Atlantic-side trips.
- Torch: on greener-water days a small light brings back colour on reefs and wrecks even in daytime.
Choosing your month: a quick decision guide
If clear water and a busy social scene matter most, come between January and April and stick to the leeward coast. If your priority is the Atlantic-side wrecks, the calm spells of May to September give the best odds, accepting more rain and some risk of storm disruption. If you want warm water, quieter boats and lower prices, late May, June and November are good bets.
Divers with fixed dates in August to October should build flexibility into the trip: avoid booking deep or remote dives for the last days, take insurance that covers cancellation and evacuation for weather, and keep an eye on the National Hurricane Center outlooks in the week before departure. Whatever the month, no forecast a week out reliably predicts underwater visibility, so plan the dives you most want early in the stay and leave room to repeat them.
One local factor is easy to forget: holidays and festivals. Spicemas reaches its climax in August, Carriacou Regatta falls around the start of August, and Independence on 7 February brings a long weekend. They make for lively evenings but busier ferries, fuller guesthouses and, occasionally, shops running reduced schedules.
Frequently asked questions
What is the water temperature in Grenada?
It ranges from about 26°C in the coolest months, roughly January to March, to around 29°C or slightly higher in September and October. The difference is small enough that a 3 mm wetsuit works year round, with a thinner suit or rash vest often enough in summer.
Is hurricane season a bad time to dive Grenada?
Not necessarily. Many days from June to November are calm, warm and excellent for diving, and Grenada is hit less often than islands further north. The risk is disruption: a passing system or distant swell can cancel several days. Flexible plans and good insurance make it workable.
When is visibility best?
Usually in the dry season from January to May, when there is little rain run-off. Visibility often reaches 20 to 30 metres on the leeward coast on good days. Late summer and autumn can bring greener water from South American river plumes, which varies a lot from year to year.
Can you dive the Atlantic side in winter?
Sometimes, but the strong trade winds of December to April often make the south-east and Atlantic wrecks too rough. Operators run them when a calm spell arrives. If those wrecks are a priority, the calmer months from May to September give better odds.
Does rain ruin diving in Grenada?
Short tropical showers have little effect. Heavy or prolonged rain washes sediment from the hills and rivers into the bays, cutting visibility near shore for a day or two. Sites further offshore and in Carriacou are usually less affected than bays close to river mouths.
Is there sargassum seaweed on the dive sites?
Sargassum mainly washes up on the Atlantic-facing east coast, typically in the warmer months, and varies sharply by year. The leeward west-coast dive sites are rarely affected. If a large mat is offshore, boats may need to steer around it on Atlantic-side trips.
