The climate of Grenada 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 June to December. 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, these winds are more irregular, and may have some pauses, increasing the feeling of sultriness. Between mid-April and late May, before the hot and rainy season, both the temperature and the frequency of downpours gradually increase.
Grenada is a country of the Lesser Antilles, located halfway between the Equator and the Tropic of Cancer, and includes the main island plus the smaller southern Grenadines.
Here are the average temperatures of St. George's, the capital. As you can see, there is little variation throughout the year.

Rainfall is abundant: in St. George's, on the south-western coast, almost 2,000 millimeters (78 inches) of rain fall per year, of which more than 100 mm (4 in) fall per month from May to January, and more than 200 mm (8 in) from June to November. The least rainy months are March and April, with 65/70 mm (2.6/2.8 in) per month on average.
Here is the average precipitation in George's.

In the southern Grenadines, administered by Grenada (Carriacou and Petite Martinique, plus some uninhabited islands), the rainfall pattern is similar, though they are a bit drier, in fact, they receive less than 1,500 mm (60 in) of rain per year. In Point Salines, in the southwestern tip of the main island, where the airport is located, being that it's a flat area and away from inland elevations, precipitation drops below 1,500 mm (60 in) per year as well.
The interior of the main island is occupied by hills and low mountains, whose highest point is St. Catherine volcano, 840 meters (2,760 feet) high, where a rainforest grows, and we can speak of equatorial climate: precipitation is abundant throughout the year, reaching up to 3,500 mm (138 in) per year, the sky is often cloudy, and the temperature is a bit lower.
The rains in Grenada and the Grenadines usually occur throughout the year in the form of downpours or thunderstorms, which could be intense, but generally do not last long, so they do not reduce too much the sunshine hours; sometimes, however, there may be a more intense wave of bad weather.
In fact, the amount of sunshine is good all year round, at least on the coast, as can be seen in the following table.



The sea in Grenada is warm enough to swim in throughout the year: the water temperature ranges from 27 °C (81 °F) in the December-April period to 29 °C (84 °F) in September and October, as we can see in the following table.

Hurricanes

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The greatest danger comes from tropical storms and cyclones, called hurricanes in the Caribbean area, which may pass over the area from June to November, though they are most likely from August to October. Grenada is located in the southernmost part of the hurricane belt, so it is rarely affected by them, although it may sometimes be affected, as happened with the following hurricanes: Hazel in October 1954, Janet in late September 1955, Joan in October 1988, Ivan in September 2004, and Felix in early September 2007.

Best Time

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The best time to visit Grenada is from February to April, since it is the driest period of the year, but all in all, January is an acceptable month as well.

What to pack

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All year round: bring light, loose-fitting clothes of natural fabric, and possibly a light sweatshirt and a light raincoat for thunderstorms; possibly a light sweatshirt for the evening from December to March.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.
When going hiking in the mountains, bring a light sweatshirt, a raincoat and hiking shoes.