Do you need to know, when is the best time to go to Grenada? Then you should take a look here, what weather you can expect there during the year.
The climate of Grenada is tropical, you can expect warm and wet weather. The weather is tempered by northeast winds. There are two seasons in the island, the rainy season from June to December, which is hot and humid, and the dry season from January to May.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Carriacou, Grenada, Hillsborough, Petit Martinique, Sauteurs, St. George's.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is June, the average maximum temperature is 31.6 ℃ (88.88 ℉). The average minimum temperature in this month is 24.7 ℃ (76.46 ℉). The coldest month here is December, the average maximum temperature is 29 ℃ (84.2 ℉). The average minimum temperature in this month is 23.1 ℃ (73.58 ℉). The most rainy month here is July, the average number of rainy days is 16.6. The least rainy month here is March, the average number of rainy days is 5. 
When travelling to some places in Grenada, always consider the altitude of the the place as well. The highest point here is Mount Saint Catherine (840 m) and the lowest point is Caribbean Sea (0 m). So there are not big differences in altitudes in this country. But the altitude affects the weather even so. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Grenada in January is this: The average highest temperature in Grenada in January is 29.7 ℃ (85.46 ℉). The average lowest temperature is 22.4 ℃ (72.32 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 29.35 ℃ (84.83 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 29.95 ℃ (85.91 ℉). The average number of rainy days in January is 10.1. The average rainfall is 46.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:28 (hours and minutes), in the middle of the month 11:32 and at the end of the month 11:38.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in February is this: The average highest temperature in Grenada in February is 30.2 ℃ (86.36 ℉). The average lowest temperature is 21.8 ℃ (71.24 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 29.95 ℃ (85.91 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 30.7 ℃ (87.26 ℉). The average number of rainy days in February is 6. The average rainfall is 47.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:38 (hours and minutes), in the middle of the month 11:46 and at the end of the month 11:54.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in March is this: The average highest temperature in Grenada in March is 31.2 ℃ (88.16 ℉). The average lowest temperature is 22.9 ℃ (73.22 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 30.7 ℃ (87.26 ℉). At the end of March you can expect lower temperatures, the average highest temperature is around 31.1 ℃ (87.98 ℉). The average number of rainy days in March is 5. The average rainfall is 42.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:54 (hours and minutes), in the middle of the month 12:04 and at the end of the month 12:13.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in April is this: The average highest temperature in Grenada in April is 31 ℃ (87.8 ℉). The average lowest temperature is 23.7 ℃ (74.66 ℉). At the beginning of April you can expect higher temperatures, the average highest temperature is around 31.1 ℃ (87.98 ℉). At the end of April you can expect lower temperatures, the average highest temperature is around 30.9 ℃ (87.62 ℉). The average number of rainy days in April is 6. The average rainfall is 45.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:13 (hours and minutes), in the middle of the month 12:22 and at the end of the month 12:31.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in May is this: The average highest temperature in Grenada in May is 30.8 ℃ (87.44 ℉). The average lowest temperature is 24 ℃ (75.2 ℉). At the beginning of May you can expect higher temperatures, the average highest temperature is around 30.9 ℃ (87.62 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 31.2 ℃ (88.16 ℉). The average number of rainy days in May is 9.1. The average rainfall is 64.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:31 (hours and minutes), in the middle of the month 12:38 and at the end of the month 12:43.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in June is this: The average highest temperature in Grenada in June is 31.6 ℃ (88.88 ℉). The average lowest temperature is 24.7 ℃ (76.46 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 31.2 ℃ (88.16 ℉). At the end of June you can expect lower temperatures, the average highest temperature is around 30.9 ℃ (87.62 ℉). The average number of rainy days in June is 15.9. The average rainfall is 147.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:43 (hours and minutes), in the middle of the month 12:46 and at the end of the month 12:46.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in July is this: The average highest temperature in Grenada in July is 30.2 ℃ (86.36 ℉). The average lowest temperature is 23.8 ℃ (74.84 ℉). At the beginning of July you can expect higher temperatures, the average highest temperature is around 30.9 ℃ (87.62 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 30.05 ℃ (86.09 ℉). The average number of rainy days in July is 16.6. The average rainfall is 185.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:46 (hours and minutes), in the middle of the month 12:43 and at the end of the month 12:37.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in August is this: The average highest temperature in Grenada in August is 29.9 ℃ (85.82 ℉). The average lowest temperature is 24 ℃ (75.2 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 30.05 ℃ (86.09 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 30.45 ℃ (86.81 ℉). The average number of rainy days in August is 15.2. The average rainfall is 165.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:37 (hours and minutes), in the middle of the month 12:30 and at the end of the month 12:22.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in September is this: The average highest temperature in Grenada in September is 31 ℃ (87.8 ℉). The average lowest temperature is 23.5 ℃ (74.3 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 30.45 ℃ (86.81 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 31 ℃ (87.8 ℉). The average number of rainy days in September is 13.9. The average rainfall is 169.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:22 (hours and minutes), in the middle of the month 12:13 and at the end of the month 12:04.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in October is this: The average highest temperature in Grenada in October is 31 ℃ (87.8 ℉). The average lowest temperature is 23.6 ℃ (74.48 ℉). At the beginning of October you can expect lower temperatures, the average highest temperature is around 31 ℃ (87.8 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 30.3 ℃ (86.54 ℉). The average number of rainy days in October is 15.8. The average rainfall is 222.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:04 (hours and minutes), in the middle of the month 11:54 and at the end of the month 11:46.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in November is this: The average highest temperature in Grenada in November is 29.6 ℃ (85.28 ℉). The average lowest temperature is 23.4 ℃ (74.12 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 30.3 ℃ (86.54 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 29.3 ℃ (84.74 ℉). The average number of rainy days in November is 15.7. The average rainfall is 209 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:46 (hours and minutes), in the middle of the month 11:38 and at the end of the month 11:32.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Grenada in December is this: The average highest temperature in Grenada in December is 29 ℃ (84.2 ℉). The average lowest temperature is 23.1 ℃ (73.58 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 29.3 ℃ (84.74 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 29.35 ℃ (84.83 ℉). The average number of rainy days in December is 12. The average rainfall is 162.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:32 (hours and minutes), in the middle of the month 11:28 and at the end of the month 11:28.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes.