Do you need to know, when is the best time to go to Saint Kitts and Nevis? Then you should take a look here, what weather you can expect there during the year.
The climate of Saint Kitts and Nevis is tropical, weather is tempered by almost constant sea breezes. You can expect only little seasonal variation of temperature. Rainy season is from May to November.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Basseterre, Nevis, Saint Kitts.
Let's look now what weather you can expect here. (Warning: As we don't have reliable data for this country, we use data from nearby locations for these statistics.) The warmest month here is July, the average maximum temperature is 32.3 ℃ (90.14 ℉). The average minimum temperature in this month is 25.6 ℃ (78.08 ℉). The coldest month here is January, the average maximum temperature is 28.4 ℃ (83.12 ℉). The average minimum temperature in this month is 23.2 ℃ (73.76 ℉). 
When travelling to some places in Saint Kitts and Nevis, always consider the altitude of the the place as well. The highest point here is Mount Liamuiga (1156 m) and the lowest point is Caribbean Sea (0 m). So the differences in altitudes in this country are not negligible and you should expect the weather to be different in places in different altitudes. 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 Saint Kitts and Nevis in January is this: The average highest temperature in Saint Kitts and Nevis in January is 28.4 ℃ (83.12 ℉). The average lowest temperature is 23.2 ℃ (73.76 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 28.65 ℃ (83.57 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 28.65 ℃ (83.57 ℉). The average rainfall is 59.3 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 11:04 (hours and minutes), in the middle of the month 11:10 and at the end of the month 11:20.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in February is this: The average highest temperature in Saint Kitts and Nevis in February is 28.9 ℃ (84.02 ℉). The average lowest temperature is 22.8 ℃ (73.04 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 28.65 ℃ (83.57 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 29 ℃ (84.2 ℉). The average rainfall is 0 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 11:20 (hours and minutes), in the middle of the month 11:33 and at the end of the month 11:47.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in March is this: The average highest temperature in Saint Kitts and Nevis in March is 29.1 ℃ (84.38 ℉). 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 29 ℃ (84.2 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 29.55 ℃ (85.19 ℉). The average rainfall is 45.8 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 11:47 (hours and minutes), in the middle of the month 12:02 and at the end of the month 12:17.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in April is this: The average highest temperature in Saint Kitts and Nevis in April is 30 ℃ (86 ℉). The average lowest temperature is 23.9 ℃ (75.02 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 29.55 ℃ (85.19 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 30.25 ℃ (86.45 ℉). The average rainfall is 0 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 12:17 (hours and minutes), in the middle of the month 12:32 and at the end of the month 12:46.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in May is this: The average highest temperature in Saint Kitts and Nevis in May is 30.5 ℃ (86.9 ℉). The average lowest temperature is 24.8 ℃ (76.64 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 30.25 ℃ (86.45 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 30.75 ℃ (87.35 ℉). The average rainfall is 49.4 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 12:46 (hours and minutes), in the middle of the month 12:58 and at the end of the month 13:07.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in June is this: The average highest temperature in Saint Kitts and Nevis in June is 31 ℃ (87.8 ℉). The average lowest temperature is 25.6 ℃ (78.08 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 30.75 ℃ (87.35 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 31.65 ℃ (88.97 ℉). The average rainfall is 0 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 13:07 (hours and minutes), in the middle of the month 13:11 and at the end of the month 13:11.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in July is this: The average highest temperature in Saint Kitts and Nevis in July is 32.3 ℃ (90.14 ℉). The average lowest temperature is 25.6 ℃ (78.08 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 31.65 ℃ (88.97 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 32 ℃ (89.6 ℉). The average rainfall is 57.9 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 13:11 (hours and minutes), in the middle of the month 13:06 and at the end of the month 12:57.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in August is this: The average highest temperature in Saint Kitts and Nevis in August is 31.7 ℃ (89.06 ℉). The average lowest temperature is 26.1 ℃ (78.98 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 32 ℃ (89.6 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 31.95 ℃ (89.51 ℉). The average rainfall is 0 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 12:57 (hours and minutes), in the middle of the month 12:45 and at the end of the month 12:32.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in September is this: The average highest temperature in Saint Kitts and Nevis in September is 32.2 ℃ (89.96 ℉). The average lowest temperature is 26.2 ℃ (79.16 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 31.95 ℃ (89.51 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 32.05 ℃ (89.69 ℉). The average rainfall is 92.1 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 12:32 (hours and minutes), in the middle of the month 12:17 and at the end of the month 12:02.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in October is this: The average highest temperature in Saint Kitts and Nevis in October is 31.9 ℃ (89.42 ℉). The average lowest temperature is 25.2 ℃ (77.36 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 32.05 ℃ (89.69 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 30.75 ℃ (87.35 ℉). The average rainfall is 0 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 12:02 (hours and minutes), in the middle of the month 11:47 and at the end of the month 11:33.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in November is this: The average highest temperature in Saint Kitts and Nevis in November is 29.6 ℃ (85.28 ℉). The average lowest temperature is 24.4 ℃ (75.92 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 30.75 ℃ (87.35 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 29.25 ℃ (84.65 ℉). The average rainfall is 55.7 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 11:33 (hours and minutes), in the middle of the month 11:20 and at the end of the month 11:10.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Saint Kitts and Nevis in December is this: The average highest temperature in Saint Kitts and Nevis in December is 28.9 ℃ (84.02 ℉). The average lowest temperature is 23.6 ℃ (74.48 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 29.25 ℃ (84.65 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 28.65 ℃ (83.57 ℉). The average rainfall is 0 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 11:10 (hours and minutes), in the middle of the month 11:04 and at the end of the month 11:03.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.