With their location in the north-east trade belt, the Windward Islands are blessed with almost perfect weather for 12 months of the year. The sea conditions in the passages between the islands can be moderate, rarely rough.
 
St Lucia's temperature ranges from 65°F to 85°F (18°C to 29°C) from December to May and 75°F to 95°F (23°C to 35°C) from June to November. The winter is relatively drier as well. Visitors should bring cool, comfortable clothing. While jacket and tie are rarely necessary, overly casual beachwear is not generally appreciated off the beach. Water temperature is fairly constant at 83°F (28°C).

 
Historical weather (Averages by month):


Month

°F Max

°F Min

°C Max

°C Min

Avg Precip (in)

Avg Wind Speed (knots)

January

82

76

28

24

18

NE10-25

February

82

76

28

24

14

E10-25

March

83

77

28

25

14

E10-25 

April

84

78

29

26

14

E10-25 

May

86

80

30

27

16

SE10-25 

June

85

81

29

27

16

SE10-25 

July

85

81

29

27

18

SE10-25 

August

86

80

30

27

20

SE10-25 

September

86

80

30

27

17

SE 10-25 

October

86

79

30

26

15

SE 10-25 

November

84

79

29

26

18

NE10-25 

December

83

77

28

25

17

NE10-25 

 

Climate
St Lucia has a tropical climate that is influenced by sea winds and the prevailing NE trade winds. The wet season is from June to September and the dry season from February to May. Average annual precipitation varies from 1,500 mm to 1,750 mm (59 to 68 inches) on the north and south coasts to 4,000 mm (157 inches) in the interior rainforest. The average temperature is 77°F (25°C) all year round.

Sailing conditions

The Windward Islands promise lively sailing. Winds blow from the north-east in winter months and from the south-east during the summer at 10 to 25 knots, strengthening around the northern ends of the islands and in squalls. This itinerary also offers sailors the opportunity to make a few longer, open-water passages between islands. Some sails can take 7 to 10 hours and one can experience open ocean swell conditions of 3 to 6 feet and more in stronger winds.

Current between the islands is generally setting towards the west at about 0.5 to 2 knots and the swell is mainly northeast to east, but can occasionally be north during the winter months.

Forecasts

The base provides a weather forecast for the next 24 hours. Guests need to consult the Sailors Guide to the Windward Islands for AM/FM stations from Martinique to Trinidad. There are locations at Blue Lagoon St Vincent, Tyrell Bay, Clifton Harbor and Bequia where forecasts are posted daily. Radio reception can be very poor in the islands. Reports can also be obtained by calling the Moorings bases by mobile phone. Hurricane season technically lasts from June to November, with the peak being around August and September.

The dominant winds

The winds are nearly always from north-east to south-east at 10 to 25 knots. The winds tend to strengthen around the northern ends of the islands.

Tides

In the Windward Islands the tidal range is very small: 30 cm to 60 cm (1 to 2 feet) including the variation of level due to atmospheric pressure and dominant winds.

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