Climate and monthly weather forecastGrenadines, Saint Vincent and the Grenadines
Climate and monthly weather forecast
The climate of Grenadines
Grenadines, an integral part of Saint Vincent and the Grenadines, falls predominantly under the AF or Tropical Rainforest Climate, according to the Köppen climate classification. Geographically positioned close to the equator, Grenadines experiences relatively consistent weather conditions throughout the year with the temperature remaining almost steady.The island territory in the Caribbean Sea draws a picture of moderate weather phenomenon with the highest temperature touching 30°C (86°F) and the lowest dipping to 21°C (69.8°F). The rainfall is observed to be substantial, reflecting the property of the Tropical Rainforest Climate. Rainfall distribution remains generous throughout the year, peaking between June and November with the highest average monthly precipitation observed in November at 207mm (8.15"). Reflecting the island's tropical nature, sea temperatures remain warm throughout the year, ranging from 27°C (80.6°F) to 29°C (84.2°F).
There exist discernible patterns in the level of daylight hours, with a gradual increase from January till midyear, where it peaks at approximately 12.9 hours in June, before tapering off towards the end of the year. The UV index is similarly distributed, with the highest values observed from February to September, indicating the requirement of sufficient protection against the sun during these months.
The best time to visit Grenadines
While Grenadines remains a welcoming destination year-round thanks to its tropical climate, the period from December to April presents optimal conditions. During this time, the rainfall is relatively lower, ranging from 57mm (2.24") to 78mm (3.07"), paired with slightly cooler sea temperatures from 27°C (80.6°F) to 28°C (82.4°F). This time of the year also corresponds with the longest average daylight hours, reaching up to 12.7 hours, along with a higher UV index, suggesting a productive time for those attracted to sun-soaked or beach holidays.The worst time to visit Grenadines
June to November is a period characterized by relatively heavy rainfall, peaking in October and November with averages of 203mm (7.99") to 207mm (8.15") respectively. Despite the high temperature of the sea and long daylight hours (from 12.5 to 12.8 hours), the consistent and heavy rainfall might prove to be a deterrent for outdoor activities and wanderings.Spring weather in Grenadines
Weather in the Grenadines from March to May is defined by a transition from lower rainfall averages, 58mm (2.28") to 76mm (2.99"), to slightly higher averages in May. With sea temperatures falling between 27°C (80.6°F) and 28°C (82.4°F), the warmth may serve as a trigger for early season leisure activities. Daylight hours increase progressively from 12.1 to 12.7 hours, offering longer days for tourists.Summer weather in Grenadines
The summer months from June to August are characterized by significant rainfall with grades as high as 155mm (6.1") to 195mm (7.68"). The sea temperature stays warm, oscillating between 28°C (82.4°F) and 29°C (84.2°F). Due to increased rainfall, daylight hours remain quite long; from 12.8 to 12.9 hours in June and July, reducing to 12.5 hours in August, while the UV index pegged consistently at a high level of 12.Autumn weather in Grenadines
Autumn in the Grenadines, from September to November, is marked by high rainfall frequencies, ranging from 186mm (7.32") in September to a peak of 207mm (8.15") in November. Alongside, sea temperatures rest at a comforting warm range from 29°C (84.2°F) to 28°C (82.4°F). The daylight period follows a descending trend, starting at 12.2 hours in September and terminating at 11.5 hours in November.Winter weather in Grenadines
Winter months in the Grenadines exhibits a mild weather pattern that typically includes decreased rainfall and moderate temperatures. From December to February, rainfall averages drop to the yearly low, ranging from 57mm (2.24") in February to 78mm (3.07") in December. Even though the sea temperatures maintain a consistent range of 27°C (80.6°F), the daylight hours and UV index decrease progressively from 11.5 hours and 10, respectively, in December, to 11.7 hours and 12 in February.Weather in January
January represents one of the cooler months in Grenadines, Saint Vincent and the Grenadines, with temperatures still being quite mild. January sees the start of the new year with fluctuating temperature high of 29°C (84.2°F) and a low of 21°C (69.8°F). Weather in January »Weather in February
As February rolls in, the weather in Grenadines, Saint Vincent and the Grenadines does not vary significantly from January. The temperatures remain relatively constant, allowing for a continuation of outdoor activities under the sun. Weather in February »Weather in March
March is a month of considerable stability in Grenadines, Saint Vincent and the Grenadines, with no major changes in the weather compared to February. The temperature, daylight hours, and UV index all stay constant, indicating a pleasing consistency for outdoor enjoyment. Weather in March »Weather in April
April in Grenadines, Saint Vincent and the Grenadines, marks the start of a slight increase in temperatures. The temperature ranges from a low of 22°C (71.6°F) and high of 30°C (86°F), providing warmer, sunny days over the island. Weather in April »Weather in May
Optimum beach weather sets in during May in Grenadines, Saint Vincent and the Grenadines, with sea temperature hitting the 28°C (82.4°F) mark. A further increase to 23°C (73.4°F) in the low temperature is noticeable. Also, a minor increase observes in the total amount of rainfall during May, signaling the start of the rainy season. Weather in May »Weather in June
June introduces the start of the summer season in Grenadines, Saint Vincent and the Grenadines. An important distinction is the doubling of rainfall volume to 155mm (6.1"), yet it does not necessarily signify a constant deluge. Sea temperatures peak, providing perfect conditions for water-based activities. Weather in June »Weather in July
As the heart of summer, July in Grenadines, Saint Vincent is notable for having the highest rainfall volume, amounting to 203mm (7.99"). The increased rainfall, however, does not significantly dampen the mood as the temperature range remains unchanged from June. Weather in July »Weather in August
August maintains the summer trend in Grenadines, Saint Vincent and the Grenadines, with a relatively high volume of rainfall, 195mm (7.68") down slightly from July’s peak. The temperatures, both on land and at sea, hold steady creating favorable conditions for a variety of activities. Weather in August »Weather in September
In September, Grenadines, Saint Vincent and the Grenadines, starts experiencing a slight decrease in various weather parameters. While still in the rainy season, total rainfall in September decreases to 186mm (7.32") when compared to August. Weather in September »Weather in October
October marks the peak of rainfall in terms of total days in Grenadines, Saint Vincent and the Grenadines, with a total of 18 days. A small rise in rainfall volume to 207mm (8.15") from September's 186mm (7.32") is also noteworthy. Weather in October »Weather in November
November's weather in Grenadines, Saint Vincent and the Grenadines, indicates a start point for the transition from the rainy season towards the drier season. A drop in total rainfall to 182mm (7.17") signifies the beginning of this shift. Weather in November »Weather in December
Rounding off the year in Grenadines, Saint Vincent and the Grenadines, December sees a notable reduction in total rainfall to 138mm (5.43"), marking a steady move towards the dry season. Even as the rainfall lessens, temperature on land and sea remains unchanged, keeping the climate enjoyable and attractive, conducive to a variety of activities. Weather in December »Updated: Jun 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Grenadines's coldest period falls in January through March and December, when the average high-temperatures ascend to 29°C (84.2°F).
Throughout the year, there are 200 rainfall days, and 1594mm (62.76") of precipitation is accumulated.
January through April and December, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater.
The months with the most sunshine are January through May and August, with an average of 8h of sunshine.
The month with the least rainfall is February, when the rain falls for 12 days and typically collects 57mm (2.24") of precipitation.
February through September, with an average maximum UV index of 12, are months with the highest UV index.
April through November are identified as the warmest months, with an average high-temperature of 30°C (86°F).
With an average of 12h and 54min of daylight, June has the longest days of the year.
The months with the least sunshine are June, July, September through December, with an average of 7h of sunshine.
The months with the warmest seawater are September and October, with an average sea temperature of 29°C (84.2°F).
October is the month with the most rainfall. Rain falls for 18 days and accumulates 207mm (8.15") of precipitation.
With an average of 11h and 24min of daylight, December has the shortest days of the year.
Grenadines, Saint Vincent and the Grenadines, does not observe Daylight Saving Time (DST). AST timezone is used throughout the entire year.
The month with the lowest UV index is December, with an average maximum UV index of 9.
Average temperature
Grenadines, Saint Vincent and the Grenadines
The warmest months (with the highest average high temperature) are April, May, June, July, August, September, October and November (30°C).
The months with the lowest average high temperature are January, February, March and December (29°C).
The months with the highest average low temperature are May, June, July, August, September and October (23°C).
The coldest months (with the lowest average low temperature) are January, February, March and December (21°C).
Average rainfall
Grenadines, Saint Vincent and the Grenadines
- Average rainfall in July:
203mm - Average rainfall in August:
195mm - Average rainfall in September:
186mm - Average rainfall in October:
207mm - Average rainfall in November:
182mm - Average rainfall in December:
138mm
The wettest month (with the highest rainfall) is October (207mm).
The driest month (with the least rainfall) is February (57mm).
Average rainfall days
Grenadines, Saint Vincent and the Grenadines
- Average rainfall days in January:
16 days - Average rainfall days in February:
12 days - Average rainfall days in March:
12 days - Average rainfall days in April:
10 days - Average rainfall days in May:
14 days - Average rainfall days in June:
18 days
- Average rainfall days in July:
21 days - Average rainfall days in August:
20 days - Average rainfall days in September:
21 days - Average rainfall days in October:
18 days - Average rainfall days in November:
20 days - Average rainfall days in December:
18 days
The months with the highest number of rainy days are July and September (21 days).
The month with the least rainy days is April (10 days).
Average sea temperature
Grenadines, Saint Vincent and the Grenadines
The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February, March, April and December (27°C).
Average daylight / Average sunshine
Grenadines, Saint Vincent and the Grenadines
- Average daylight in January:
11h and 30min - Average daylight in February:
11h and 42min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 24min - Average daylight in May:
12h and 42min - Average daylight in June:
12h and 54min
- Average daylight in July:
12h and 48min - Average daylight in August:
12h and 30min - Average daylight in September:
12h and 12min - Average daylight in October:
11h and 48min - Average daylight in November:
11h and 30min - Average daylight in December:
11h and 24min
The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).
The months with the most sunshine are January, February, March, April, May and August (Average sunshine: 8h).
The months with the least sunshine are June, July, September, October, November and December (Average sunshine: 7h).
Average UV index
Grenadines, Saint Vincent and the Grenadines
The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).
