The climate in St. Kitts and Nevis is tropical, hot and humid all year round, with a relatively cool and dry season from January to mid-April, and a hot, humid and rainy season from mid-June to mid-November. In the former period, the northeast trade winds, constant winds typical of tropical climates, blow steadily and with moderate intensity, while in the latter period the winds are more irregular, and may have some breaks, increasing the feeling of sultriness. Between them there are two transitional periods: from mid November to early January (when the northeast wind starts to blow, the temperature decreases a bit and the weather improves) and from mid-April to Mid-June (when both the temperature and the frequency of downpours gradually increase).
Saint Kitts and Nevis is a state in the group of the Lesser Antilles, formed by the two islands of the same name, with Basseterre as the capital city.
The daily average temperature is around 25 degrees Celsius (77 °F) in January and February and 28 °C (82 °F) from June to October, which is the hottest period.
Here are the average temperatures of Basseterre.

Rainfall amounts to around 1,200 millimeters (47 inches) per year along the coast. The rainiest period, when precipitation exceeds 100 mm (4 in) per month, runs from July to November, while the driest runs from February to April, when rainfall does not exceed 60 mm (2.4 in) per month.
Here is the average precipitation.

The rains, as is normally the case in countries having a tropical climate, occur primarily in the form of downpours or thunderstorms, so they do not reduce too much the hours of sunshine, and are quite irregular, which means that there may be periods without rainfall in every month of the year, but also periods of heavy rains for several consecutive days.
In fact, the amount of sunshine is good all year round, at least along the coasts, as can be seen in the following table.

On each of the two islands there is a volcano: Mount Liamuiga, formerly Mount Misery, 1,156 meters (3,793 feet) high, and Nevis Peak, 985 meters (3,232 feet) high. On the slopes, the climate is very humid, with more abundant rainfall than on the coast, so much so that above 900 meters (3,000 feet) the vegetation is lush and made up of cloud forests.



The sea in Saint Kitts and Nevis is warm enough for swimming all year round, as we can see from the following table.

Hurricanes

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From June to November, in St. Kitts and Nevis 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

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The best time to visit Saint Kitts and Nevis is from December to April, since it is the least hot and also outside the period of hurricanes. Within this period, the period from February to April stands out as the driest. In the summer months, the weather is hot and sultry, and thunderstorms are more common, although they rarely lead to very heavy rains. However, in August and September there's a greater chance of heavy rains than in June and July, and also a greater chance of hurricanes.

What to pack

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From December to April: bring light clothing, a light sweatshirt for the evening.
From May to November: bring lightweight clothing, and possibly a light sweatshirt and a light raincoat for thunderstorms.