Anguilla has a tropical climate, hot all year round, with a slightly cooler period from December to March and a hotter, muggy period from May to October. Luckily, sea breezes are able to relieve a bit the heat of the day.
Here are the average temperatures in the capital, The Valley.
The Valley - Average temperatures
Min (°C)232323252526262626262524
Max (°C)282828283031313131302928
Min (°F)737373777779797979797775
Max (°F)828282828688888888868482

Anguilla is located in the northernmost part of the Lesser Antilles, and it's a British overseas territory, formed by the main island, where the capital is found, plus some small coral islands.
Rainfall is generally not very abundant, since it amounts to around 1,000 millimeters (40 inches) per year. February and March are usually the driest months, with about 45 mm (1.8 in) per month on average, while in the rest of the year, the rains are quite irregular, although they rarely reach high values. Normally, the rainy period is from August to November, though with moderate rainfall, between 100 and 130 mm (4 and 5 in) per month. During some years, there may be another peak of precipitation in April and May. As normally happens in tropical areas, the rains usually fall in the form of downpours or thunderstorms, in days when the sun shines for a few hours anyway. More rarely, there can be heavy and prolonged rains, when tropical depressions and hurricanes hit the islands (see below).
Here is the average precipitation.
The Valley - Average precipitation

The amount of sunshine is good all year round, as can be seen in the following table.
The Valley - Sunshine


The sea in Anguilla is warm enough for swimming all year round, although it's of course a bit warmer in the summer months. Here are the average sea temperatures.
The Valley - Sea temperature
Temp (°C)262626262728282829292827
Temp (°F)797979798182828284848281


From June to November, in Anguilla as in the whole area of the West Indies, there is the danger of tropical storms and hurricanes, with greater probability from August to October.

Best Time

The best time to visit Anguilla runs from December to April, a period when the temperatures are a bit lower and outside of the hurricane season, and particularly the months of February and March, which are the driest ones. In summer, in June and July, it usually rains a bit less than in August, and there is also a lower probability of hurricanes.

What to pack

From December to April: bring light clothing, and a light sweater or sweatshirt for the evening and for the breeze.
From May to November: bring lightweight, loose-fitting clothing, and possibly a light sweatshirt and a light raincoat for thunderstorms.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.